JP6573151B2 - Manufacturing method of solar cell - Google Patents

Description

  The present invention relates to a method for manufacturing a solar cell.

  In a solar cell, in order to output generated electric power to the outside, a collector electrode is formed on the surface thereof. In Patent Document 1, it is proposed to repeat the screen printing process a plurality of times at the position where the collector electrode is formed in order to form the collector electrode.

JP 11-103084 A JP 2009-158858 A

  When the solar cell manufactured by repeating the process of forming the collector electrode a plurality of times on the same main surface of the solar cell as in Patent Document 1 does not exhibit desired characteristics, the solar cell is regarded as an unnecessary product. May be disposed of. In general, the collector electrode is formed of an expensive material such as silver. For this reason, it is not preferable to use a large amount of the material for forming the collecting electrode in the solar cell to be disposed of.

  The objective of this invention is providing the manufacturing method which can improve economical efficiency in the method of manufacturing a solar cell by repeating the process of forming a collector electrode in multiple times.

The manufacturing method of the present invention includes a step of preparing a photoelectric conversion cell having a first main surface and a second main surface, a first collector electrode is formed on the first main surface, and the second A step of forming a second collector electrode on the main surface, a step of measuring a characteristic value of the photoelectric conversion cell on which the first collector electrode and the second collector electrode are formed, and based on the characteristic value Forming a third collector electrode on at least one of the first main surface and the second main surface, wherein the third collector electrode is formed on the first main surface. first focusing said at least one and Oite the first main surface at a position that does not overlap the finger electrodes and the finger electrodes of the second collector electrode on said second major surface of the electrode finger electrodes and the second Are formed substantially parallel to at least one of the finger electrodes on the main surface .

  According to the present invention, economic efficiency can be improved in a method of manufacturing a solar cell by repeating the step of forming a collector electrode a plurality of times.

It is a flowchart for demonstrating the manufacturing method of the solar cell of 1st and 2nd embodiment. It is a schematic plan view which shows the 1st collector electrode provided on the 1st main surface of the solar cell of 1st and 2nd embodiment. It is a schematic plan view which shows the 2nd collector electrode provided on the 2nd main surface of the solar cell of 1st and 2nd embodiment. It is typical sectional drawing which shows a part of cross section which follows the AA line shown in FIG. In a 1st embodiment, it is a typical sectional view showing the state formed so that the 3rd current collection electrode might be piled up on the 1st current collection electrode of the 1st principal surface. In 1st Embodiment, it is a typical top view which shows the state by which the 3rd collector electrode which has the same width | variety as a 1st collector electrode on the 1st collector electrode was displaced and overlapped. In 1st Embodiment, it is a typical top view which shows the state with which the 3rd collector electrode was piled up on the 1st collector electrode narrower than a 3rd collector electrode, without position shifting. In 1st Embodiment, it is a typical top view which shows the state which the 3rd collector electrode piled up on the 1st collector electrode whose width | variety is narrower than a 3rd collector electrode, shifted in position. In 2nd Embodiment, it is a typical top view which shows the state on which the 3rd collector electrode narrower than a 1st collector electrode was piled up on the 1st collector electrode without shifting. In 2nd Embodiment, it is a typical top view which shows the state by which the 3rd collector electrode narrower than a 1st collector electrode was piled up in position shift on the 1st collector electrode. It is a figure for demonstrating an example of the method of measuring the characteristic value of a photoelectric conversion cell. It is a figure for demonstrating an example of the method of measuring the characteristic value of a photoelectric conversion cell. It is a figure for demonstrating an example of the manufacturing method of the solar cell using an auxiliary electrode. It is a figure for demonstrating an example of the manufacturing method of the solar cell using an auxiliary electrode. It is a figure which shows the state which connected the 3rd collector electrode to the bus-bar electrode. It is a figure for demonstrating an example of the manufacturing method of the solar cell using the electrode for a connection. It is a figure for demonstrating an example of the manufacturing method of the solar cell using the electrode for a connection.

  Hereinafter, preferred embodiments will be described. However, the following embodiments are merely examples, and the present invention is not limited to the following embodiments. Moreover, in each drawing, the member which has the substantially the same function may be referred with the same code | symbol.

(First and second embodiments)
FIG. 1 is a flowchart for explaining a method for manufacturing solar cells according to the first and second embodiments.

  As shown in FIG. 1, in step S1, a photoelectric conversion cell is manufactured. The photoelectric conversion cell can be manufactured in the same manner as a photoelectric conversion cell of a general solar battery. For example, an amorphous semiconductor layer of another conductivity type is formed on the first main surface side of a semiconductor substrate of one conductivity type, and a transparent conductive film is formed thereon. An amorphous semiconductor layer of one conductivity type is formed on the second main surface side, and a transparent conductive film is formed thereon. In this embodiment, a p-type amorphous silicon layer and a transparent conductive film are formed on the first main surface side of the n-type crystalline silicon substrate, and an n-type amorphous silicon layer and a second conductive surface are formed on the second main surface side. A transparent conductive film is formed. In this embodiment, the p-type amorphous silicon layer has a layer structure in which an i-type amorphous silicon film and a p-type amorphous silicon film are formed in this order. The n-type amorphous silicon layer has a layer structure in which an i-type amorphous silicon film and an n-type amorphous silicon film are formed in this order.

  In step S2, a first collector electrode is formed on the first main surface of the photoelectric conversion cell, that is, on the transparent conductive film on the first main surface side, and on the second main surface of the photoelectric conversion cell, That is, the second collector electrode is formed on the transparent conductive film on the second main surface side.

  FIG. 2 is a schematic plan view showing a first collector electrode provided on the first main surface of the solar cell of the first and second embodiments. As shown in FIG. 2, on the 1st main surface 10 of the photoelectric conversion cell 1, the 1st finger electrode 12 extended in a 1st direction (x direction) and the 2nd which cross | intersects a 1st direction The first bus bar electrode 13 extending in the direction (y direction) is formed. In the present embodiment, the first collector electrode 11 is constituted by the first finger electrode 12 and the first bus bar electrode 13.

  FIG. 3 is a schematic plan view showing a second collector electrode provided on the second main surface of the solar cell of the first and second embodiments. As shown in FIG. 3, on the second main surface 20 of the photoelectric conversion cell 1, a second finger electrode 22 extending in the first direction (x direction) and a second crossing the first direction. A second bus bar electrode 23 extending in the direction (y direction) is formed. In the present embodiment, the second collector electrode 21 is configured by the second finger electrode 22 and the second bus bar electrode 23.

  4 is a schematic cross-sectional view showing a part of a cross section taken along the line AA shown in FIG. As shown in FIG. 4, in the present embodiment, the second finger electrode 22 is formed at a position corresponding to the first finger electrode 12. Further, the number of second finger electrodes 22 is provided to be larger than the number of first finger electrodes 12. However, the present invention is not limited to this, and the second finger electrode 22 may be formed at a position shifted from a position corresponding to the first finger electrode 12, or the first finger electrode The number of twelve and the number of second finger electrodes 22 may be the same.

  In the present embodiment, the first collector electrode 11 and the second collector electrode 21 are formed by screen printing a conductive paste containing silver particles or the like. However, the present invention is not limited to this, and the first collector electrode 11 and the second collector electrode 21 may be formed by a method such as an inkjet method or offset printing. In the present embodiment, the first finger electrode 12 and the first bus bar electrode 13 are integrally formed by screen printing. Similarly, the second finger electrode 22 and the second bus bar electrode 23 are integrally formed by screen printing.

  In this embodiment, the 1st main surface 10 is a light-receiving surface, and the 2nd main surface 20 is a back surface. However, the present invention is not limited to this, and may be a double-sided light receiving photoelectric conversion cell in which the first main surface 10 and the second main surface 20 are light receiving surfaces, respectively.

  Referring to FIG. 1, in step S3, the photoelectric conversion cell 1 in which the first collector electrode 11 and the second collector electrode 21 are formed as described above is measured and evaluated. The measuring method of the characteristic value of the photoelectric conversion cell 1 can be measured based on JIS C 8913, for example. Examples of the characteristic value to be measured include characteristic values measured in JIS C 8913. Specific examples of characteristic values include maximum output Pm, short circuit current Isc, open circuit voltage Voc, fill factor FF, solar cell conversion efficiency η, and the like. These characteristic values may be evaluated independently or may be evaluated in combination.

  As shown in FIGS. 11 and 12, in step S3, a plurality of current measurement terminals 51 and 61 and a plurality of voltage measurement terminals 52 and 62 are brought into contact with the first collector electrode 11 and the second collector electrode 21, respectively. The above characteristic values are preferably measured by a four-terminal method. Each terminal is brought into contact with the bus bar electrodes 13 and 23, respectively. In addition, when a bus-bar electrode is not provided, each terminal is made to contact on a finger electrode, for example. Each current measuring terminal 51, 61 is connected to an ammeter, and each voltage measuring terminal 52, 62 is connected to a voltmeter. Three or more current measuring terminals 51 and 61 and three or more voltage measuring terminals 52 and 62 can be attached.

  The above characteristic values can be measured by the two-terminal method, but by applying the four-terminal method, the influence of the voltage drop due to the contact resistance between the collector electrode and the terminal, cable resistance, etc. can be reduced, and the variation in the measured voltage can be suppressed. Can do. That is, by applying the 4-terminal method, the measurement accuracy of the characteristic value is improved. Further, by increasing the number of terminals within a range that does not hinder operability and the like, variation in the measured value is reduced, and the standard deviation σ of the measured value of the fill factor FF is improved.

  In the example shown in FIGS. 11 and 12, the current measurement terminal 51 and the voltage measurement terminal 52 that are in contact with the first collector electrode 11 are pin-like terminals that can contact the collector electrode independently. On the other hand, the current measurement terminal 61 and the voltage measurement terminal 62 that are in contact with the second collector electrode 21 are blocks each having a block shape, and the blocks are alternately connected via insulators 63. . The current measurement terminal 61 and the voltage measurement terminal 62 are formed in a single bar in a line. The current measuring terminal 61 and the voltage measuring terminal 62 which are rod-shaped terminals are formed so that the surface facing the second collector electrode 21 is substantially flat, and the surface facing the second collector electrode 21 of the rod-shaped terminals is formed. The second collector electrode 21 is continuously contacted. Note that a pin-shaped terminal may be in contact with one main surface side, and a rod-shaped terminal may be in contact with the other main surface side. For example, the rod-shaped terminal is in contact with the first collector electrode 11, and the second collector electrode 21 is The pin-shaped terminal may be in contact. Further, the current measurement terminals 51 and the voltage measurement terminals 52 do not need to be alternately arranged for each terminal. For example, five current measurement terminals 51 and one voltage measurement terminal 52 are periodically arranged. May be alternately arranged. Similarly, the current measurement terminals 61 and the voltage measurement terminals 62 may be alternately arranged periodically. By using the pin-shaped terminal and the rod-shaped terminal in this manner, the characteristic value can be measured with high accuracy while suppressing cracking of the photoelectric conversion cell 1.

  As shown in FIG. 12, the first bus bar electrode 13 (first collector electrode 11) is disposed on the upper surface in the vertical direction, and the second bus bar electrode 23 (second collector electrode 21) is disposed on the lower surface in the vertical direction. In the case of arrangement, it is preferable that a pin-shaped terminal is in contact with the first bus bar electrode 13 and a bar-shaped terminal is in contact with the second bus bar electrode 23. In this case, first, the rod-shaped terminal is brought into contact with the second bus bar electrode 23, and then the pin-shaped terminal is brought into contact with the first bus bar electrode 13, and the characteristic value is measured. Since the pin-shaped terminals are in discrete contact with the first bus bar electrode 13 so that a region that contacts the pin-shaped terminal and a region that does not contact the first bus-bar electrode 13, the applied pressure becomes uneven. However, since the rod-shaped terminal arranged on the back side is formed substantially flat and is continuously in contact with the second bus bar electrode 23, the pressure by the pin-shaped terminal is dispersed. Thereby, the said characteristic value can be measured with high precision, suppressing the crack of the photoelectric conversion cell 1 by process S3.

  As one of alternatives to the measurement apparatus and the measurement method shown in FIG. 12, the measurement terminals on both sides contacting the first bus bar electrode 13 and the second bus bar electrode 23 are a pin-like terminal including a plurality of terminals. It is possible to do. However, when the measurement terminals on both sides are pin-shaped terminals, the planar shape of the photoelectric conversion cell 1 is composed of a pin-shaped terminal that contacts the first bus bar electrode 13 and a pin-shaped terminal that contacts the second bus bar electrode 23. If a difference occurs in the position at, a large pressure is locally applied to the photoelectric conversion cell 1, which may cause cracking of the photoelectric conversion cell 1. Further, as one of alternatives to the measuring apparatus and the measuring method shown in FIG. 12, it is considered that the measurement terminals on both sides contacting the first bus bar electrode 13 and the second bus bar electrode 23 are rod-shaped terminals. It is done. However, the photoelectric conversion cell 1 may have irregularities in a range that does not hinder the power generation function. At this time, when the measurement terminals on both sides are rod-shaped terminals, a locally large pressure is applied to the convex portion of the photoelectric conversion cell. In addition, the photoelectric conversion cell 1 may be cracked. By adopting the measuring apparatus and the measuring method shown in FIG. 12, the characteristic value can be measured with high accuracy while suitably suppressing the cracking of the photoelectric conversion cell 1.

  The circuit connecting the voltage measuring terminals 52 and 62 and the voltmeter has a resistance higher than the resistance of the first collector electrode 11 and the second collector electrode 21, that is, the bus bar electrodes 13 and 23, which are in contact with the terminals. Can be inserted. Thereby, the influence of the resistance of the bus bar electrodes 13 and 23 is eliminated, and the voltage measurement accuracy is further improved.

  In step S4, a third collector electrode is formed on at least one of the first main surface and the second main surface based on the characteristic value measured in step S3. For example, the third collector electrode is formed on at least one of the first main surface and the second main surface for the photoelectric conversion cell 1 whose characteristic value satisfies a predetermined standard. In the first and second embodiments described below, the third collector electrode is formed on the first main surface.

  Similarly to the first collector electrode 11 and the second collector electrode 21, the third collector electrode can also be formed by screen printing a conductive paste containing silver particles or the like. Further, the third collector electrode may be formed by a method such as an inkjet method or offset printing.

  In the first and second embodiments, the third collector electrode is formed only for the photoelectric conversion cell 1 whose characteristic value measured in step S3 satisfies a predetermined standard. The photoelectric conversion cell 1 whose characteristic value does not satisfy the predetermined standard has a high probability of being a defective product even when the third collector electrode is formed. By not forming the third collector electrode in the photoelectric conversion cell 1 that has a high probability of being a defective product, it is possible to save the third collector electrode forming material that is wasted and to improve the economic efficiency. In addition, the step S4 can be applied to the photoelectric conversion cell 1 whose characteristic value does not satisfy the predetermined standard. In this case, the photoelectric conversion cell 1 having a low maximum power is improved in power and the photoelectric conversion cell 1 having a high maximum power is improved. More conversion cells 1 can be produced.

(First embodiment)
In the first embodiment, the third collector electrode is formed so as to at least partially overlap the first collector electrode on the first main surface.

  FIG. 5 is a schematic cross-sectional view showing a state in which the third collector electrode is formed to overlap the first collector electrode on the first main surface in the first embodiment. Specifically, as shown in FIG. 5, the third collector electrode 31 is formed so as to overlap the first finger electrode 12 of the first collector electrode 11. The third collector electrode 31 may also be formed on the first bus bar electrode 13 of the first collector electrode 11 so as to overlap the first bus bar electrode 13.

  By forming the third collector electrode 31 on the first collector electrode 11 so as to at least partially overlap, the surface of the collector electrode can be planarized. For this reason, since the thickness of a collector electrode can be thickened, the electrical resistance of the 1st finger electrode 12 can be reduced and current collection property can be improved.

  FIG. 6 is a schematic plan view showing a state in which the third collector electrode 31 is superimposed on the first finger electrode 12 of the first collector electrode while being displaced in the first embodiment. . In FIG. 6, the third collector electrode 31 is indicated by a one-dot chain line. Also in the following drawings, the third collector electrode 31 may be indicated by a one-dot chain line.

  The width W1 of the first finger electrode 12 in the second direction (y direction) and the width W2 of the third collector electrode 31 in the second direction (y direction) are substantially the same. As shown in FIG. 6, the first finger electrode 12 and the third collector electrode 31 are overlapped by forming the third collector electrode 31 with a distance L shifted in the second direction (y direction). The width of the collector electrode is W3. Since the width W3 of the collector electrode is thicker than the width W1 of the first finger electrode 12 and the width W2 of the third collector electrode 31, the area to be shielded from light increases, so the short-circuit current Isc of the photoelectric conversion cell 1 decreases. To do.

  FIG. 7 shows that, in the first embodiment, the third collector electrode 31 is superimposed on the first finger electrode 12 having a width W1 narrower than the width W2 of the third collector electrode 31 without being displaced. It is a schematic plan view which shows the state.

  FIG. 8 is a schematic plan view showing a state in which the third collector electrode 31 shown in FIG. 7 is superimposed on the first finger electrode 12 while being displaced. As shown in FIG. 8, when the first finger electrode 12 has a width W1 that is narrower than the width W2 of the third collector electrode 31, even if the third collector electrode 31 is displaced, The width is W2, and it can be prevented that the width of the stacked collector electrode is shifted and thickened. For this reason, it is possible to reduce the variation in the width of the stacked collector electrodes without depending on the degree of displacement of the third collector electrode 31.

  The third collector electrode 31 is preferably provided in a region of the finger electrode 12 close to the bus bar electrode 13 and not provided in a region away from the bus bar electrode 13. In the region of the finger electrode 12 close to the bus bar electrode 13, the current flowing from the region of the finger electrode 12 away from the bus bar electrode 13 and the current collected in the region close to the bus bar electrode 13 flow. For this reason, the region near the bus bar electrode 13 of the finger electrode 12 has a higher current density than the region of the finger electrode 12 away from the bus bar electrode 13, which may cause resistance loss and lower the current collection performance. By partially increasing the thickness of the finger electrode 12 in the region close to the bus bar electrode 13, it is possible to reduce the electric resistance in the region where the current density is increased while saving the amount of use of the forming material.

(Second Embodiment)
In FIG. 9, in the second embodiment, a third collector electrode 31 having a width W2 narrower than the width W1 of the first finger electrode 12 is superimposed on the first finger electrode 12 without being displaced. It is a schematic plan view which shows the state.

  FIG. 10 is a schematic plan view showing a state in which the third collector electrode 31 shown in FIG. 9 is superimposed on the first finger electrode 12 while being displaced. As shown in FIG. 10, when the third collector electrode 31 has a width W2 narrower than the width W1 of the first finger electrode 12, even if the third collector electrode 31 is displaced, The width is W2, and it is possible to prevent the stacked collector electrodes from becoming thick. For this reason, the increase in the area | region shielded from light can be suppressed and it can suppress that the short circuit current Isc of the photoelectric conversion cell 1 falls.

  Also in the second embodiment, as in the first embodiment, the third collector electrode 31 is provided in a region of the finger electrode 12 close to the bus bar electrode 13 and not provided in a region away from the bus bar electrode 13. It is preferable that By partially increasing the thickness of the finger electrode 12 in the region close to the bus bar electrode 13, it is possible to reduce the electric resistance in the region where the current density is increased while saving the amount of use of the forming material.

  In the first and second embodiments, the third collector electrode is formed at a position overlapping the first collector electrode on the first main surface of the photoelectric conversion cell 1. However, you may form a 3rd collector electrode in the position which overlaps with the 2nd collector electrode on the 2nd main surface of a photoelectric conversion cell. When the third collector electrode is formed on the second main surface of the photoelectric conversion cell, the third collector electrode may be formed at a position that does not overlap with the second collector electrode.

  When the third collector electrode is formed at a position that does not overlap the second collector electrode, the area of the collector electrode on the second main surface 20 can be increased, and the current collecting property on the second main surface 20 can be increased. Can be increased.

  In the first and second embodiments, the third collector electrode is formed on the first main surface. However, the present invention is not limited to this. Therefore, the third collector electrode may be formed on both the first main surface and the second main surface.

  When the third collector electrode is formed only on the first main surface, the second collector electrode 21 provided on the second main surface is composed of the second finger electrode 22 and the second bus bar electrode 23. The electrode may not be a comb-shaped electrode. For example, a thin film metal electrode that covers substantially the entire second main surface of the photoelectric conversion cell 1 may be formed on the second main surface.

  As shown in FIGS. 13 and 14, an auxiliary electrode 41 can be formed on the photoelectric conversion cell 1. In the example shown in FIGS. 13 and 14, the auxiliary electrode 41 and the third collector electrode 31 are formed on the first main surface 10, but these may be formed on the second main surface 20, It may be formed on both sides. Here, the first main surface 10 is described as an example, but the following description can be similarly applied to the second main surface 20.

  The first collector electrode 11 illustrated in FIGS. 13 and 14 is formed to intersect with the finger electrode 12 and the finger electrode 12, and the bus bar electrode 13 to which the wiring member 50 (indicated by a one-dot chain line) is attached when modularized. And have. For example, two or three bus bar electrodes 13 are formed substantially parallel to each other, and a plurality of finger electrodes 12 are formed substantially orthogonal to each bus bar electrode 13. The first collector electrode 11 has an auxiliary electrode 41 formed so as to intersect with the finger electrode 12 outside the range in which the wiring member 50 is disposed (a region located immediately below the wiring member 50). The auxiliary electrode 41 is formed along the bus bar electrode 13 and is preferably formed substantially parallel to the bus bar electrode 13.

  The auxiliary electrode 41 is an electrode connected to the third collector electrode 31 when the third collector electrode 31 is formed based on the characteristic value of the photoelectric conversion cell 1. In the form illustrated in FIGS. 13 and 14, the auxiliary electrode 41 is provided to reduce the unevenness of the electrode within the range where the wiring member 50 is disposed. When the third collector electrode 31 is connected to the auxiliary electrode 41, the height of the electrode locally increases at the connection portion 32 (see FIG. 14), but the wiring member 50 is not disposed on the connection portion 32.

  The auxiliary electrode 41 is formed at the same time as the finger electrode 12 and the bus bar electrode 13, for example, but may be formed at the same time as the third collector electrode 31. In the latter case, the height of the electrode is locally increased at the connection portion between the finger electrode 12 and the auxiliary electrode 41, but the connection portion is also located outside the range where the wiring member 50 is disposed.

  The length of the auxiliary electrode 41 is not particularly limited, but preferably has substantially the same length as the bus bar electrode 13 and is connected to all the finger electrodes 12. The number of auxiliary electrodes 41 is not particularly limited, but preferably two for each bus bar electrode 13, so that the two sandwich the bus bar electrode 13. That is, the auxiliary electrode 41 is formed on both sides of the bus bar electrode 13 in the width direction.

  The third collecting electrode 31 is formed so as to be connected to the auxiliary electrode 41 as described above and connected to the bus bar electrode 13 through the finger electrode 12 without being connected to the bus bar electrode 13. In the example shown in FIGS. 13 and 14, a third collector electrode 31 is formed between the adjacent finger electrodes 12 and substantially parallel to the finger electrodes 12. That is, the third collector electrode 31 is formed at a position that does not overlap the first collector electrode 11, but may be formed at a position that overlaps the finger electrode 12 as in the embodiments shown in FIGS. 5 to 10. . It is preferable that the third collector electrode 31 is not formed within a range in which one end is connected to the auxiliary electrode 41 and the wiring member 50 is disposed.

  As shown in FIG. 15, the third collector electrode 31 can be formed on the photoelectric conversion cell 1 in a region that does not overlap the finger electrode 12. In the example shown in FIG. 15, the third collector electrode 31 is formed on the first main surface 10, but these may be formed on the second main surface 20 or may be formed on both surfaces. Good. Here, the first main surface 10 is described as an example, but the following description can be similarly applied to the second main surface 20.

  The first collector electrode 11 illustrated in FIG. 15 includes a finger electrode 12 and a bus bar electrode 13 that is formed to intersect the finger electrode 12 and to which a wiring member 50 (not shown) is attached when modularized. For example, two or three bus bar electrodes 13 are formed substantially parallel to each other, and a plurality of finger electrodes 12 are formed substantially orthogonal to each bus bar electrode 13. The third collector electrode 31 is formed substantially in parallel with the finger electrode 12 including the area where the wiring member 50 is disposed (the region located immediately below the wiring member 50), and overlaps the bus bar electrode 13 at the connection portion 33. Thus, a region where the height of the electrode is locally high is formed.

  As shown in FIG. 15, when the third collector electrode 31 is connected to the bus bar electrode 13, the height of the electrode is locally increased at the connection portion 33, and the wiring member 50 is crimped onto the bus bar electrode 13. The connecting portion 33 and the wiring member 50 are in contact with each other. At this time, the surface area of the bus bar electrode 13 is increased by the locally increased connection portion 33, and the adhesion to the wiring member 50 is improved. Such a configuration is suitable when the bus bar electrode 13 and the wiring member 50 are connected using a resin adhesive containing an epoxy resin, an acrylic resin, or a urethane resin as described in Patent Document 2. By improving the adhesion between the connection portion 33 and the wiring member 50, the connection reliability between the bus bar electrode 13 and the wiring member 50 can be improved.

  As shown in FIGS. 16 and 17, a connection electrode 42 can be formed on the photoelectric conversion cell 1. In the example shown in FIGS. 16 and 17, the connection electrode 42 and the third collector electrode 31 are formed on the first main surface 10, but these may be formed on the second main surface 20. It may be formed on both sides. Here, the first main surface 10 is described as an example, but the following description can be similarly applied to the second main surface 20.

  The first collector electrode 11 illustrated in FIGS. 16 and 17 has the finger electrode 12 and the bus bar electrode 13 in the same manner as the embodiment illustrated in FIGS. The first collector electrode 11 has a connection electrode 42 extending from the bus bar electrode 13 and extending beyond the range where the wiring member 50 is disposed. The connection electrode 42 is formed along the finger electrode 12, and is preferably formed substantially orthogonal to the bus bar electrode 13 and substantially parallel to the finger electrode 12. However, the connection electrode 42 is shorter than the finger electrode 12. The length of the connection electrode 42 is preferably equal to the width W5 of the wiring material 50 or equivalent to W5 or more and twice or less W5 in consideration of material cost, light shielding loss, positional displacement of the wiring material 50, and the like. It is formed in the range.

  The number of connection electrodes 42 is not particularly limited, and is, for example, the same as the number of finger electrodes 12. In the example shown in FIG. 16, one connection electrode 42 is formed between adjacent finger electrodes 12, but there is a portion where the connection electrode 42 is not formed between adjacent finger electrodes 12. There may be a portion where two or more are formed. The connection electrode 42 is preferably formed simultaneously with the finger electrode 12 and the bus bar electrode 13.

  The connection electrode 42 is an electrode connected to the third collector electrode 31 when the third collector electrode 31 is formed based on the characteristic value of the photoelectric conversion cell 1. The third collector electrode 31 is formed so as to be connected to the connection electrode 42 and not connected to the bus bar electrode 13. When the third collecting electrode 31 is connected to the connecting electrode 42, the height of the electrode locally increases at the connecting portion, but the wiring member 50 is not disposed on the connecting portion.

  At the end portion of the third collector electrode 31, a widened portion 34 having a width wider than that of other portions is formed. The third collector electrode 31 is preferably formed on the same straight line as the connection electrode 42, but the third collector electrode 31 may be formed shifted from the same straight line. By providing the widened portion 34, the connection with the connection electrode 42 can be more reliably performed even when the third collector electrode 31 is misaligned. It is possible to provide a widened portion at the end of the connecting electrode 42, or to form the connecting electrode 42 thicker instead of providing the widened portion. It is preferable to provide the widened portion 34 on the collector electrode 31 side.

  In the example shown in FIG. 17, a third collector electrode 31 is formed between the adjacent finger electrodes 12 so as to be substantially parallel to the finger electrodes 12. That is, the third collector electrode 31 is formed at a position that does not overlap the first collector electrode 11, but may be formed at a position that overlaps the finger electrode 12 as in the embodiments shown in FIGS. 5 to 10. .

  In the manufacturing process of the solar cell module in which the wiring member 50 is attached to the photoelectric conversion cell 1, the first printed electrode (first collecting electrode 11) and the second printed electrode (third collecting electrode 31). It can be said that it is preferable to arrange the wiring member 50 so as to avoid the connection portion to the above. Thereby, the crack of the photoelectric conversion cell 1 is suppressed and the yield of a module improves.

  In the above embodiment, the first main surface is the light receiving surface and the second main surface is the back surface. However, the second main surface may be the light receiving surface and the first main surface may be the back surface. .

DESCRIPTION OF SYMBOLS 1 ... Photoelectric conversion cell 10 ... 1st main surface 11 ... 1st collector electrode 12 ... 1st finger electrode 13 ... 1st bus-bar electrode 20 ... 2nd main surface 21 ... 2nd collector electrode 22 ... 1st Two finger electrodes 23 ... second bus bar electrode 31 ... third collector electrodes 32 and 33 ... connection part 34 ... widening part 41 ... auxiliary electrode 42 ... connection electrode 51 ... pin terminal 52 for current measurement ... for voltage measurement Pin-shaped terminal 61 ... Block terminal for current measurement 62 ... Block terminal for voltage measurement 63 ... Insulator

Claims (15)

Preparing a photoelectric conversion cell having a first main surface and a second main surface;
Forming a first collector electrode on the first main surface and forming a second collector electrode on the second main surface;
Measuring a characteristic value of a photoelectric conversion cell in which the first collector electrode and the second collector electrode are formed;
Forming a third collector electrode on at least one of the first main surface and the second main surface based on the characteristic value;
With
The third collector electrode is positioned so as not to overlap at least one of the finger electrode of the first collector electrode on the first main surface and the finger electrode of the second collector electrode on the second main surface. A method of manufacturing a solar cell, wherein the solar cell is formed substantially parallel to at least one of the finger electrode on the first main surface and the finger electrode on the second main surface .   The method for manufacturing a solar cell according to claim 1, wherein the third collector electrode is formed for a photoelectric conversion cell having a characteristic value satisfying a predetermined criterion.   3. The method of manufacturing a solar cell according to claim 1, wherein the third collector electrode is formed so as to at least partially overlap the first collector electrode of the first main surface.   The method for manufacturing a solar cell according to claim 3, wherein a width of the first collector electrode is narrower than a width of the third collector electrode.   The method for manufacturing a solar cell according to claim 3, wherein a width of the third collector electrode is narrower than a width of the first collector electrode.   The said 3rd collector electrode is a manufacturing of the solar cell as described in any one of Claims 1-5 formed so that at least one part may overlap with the said 2nd collector electrode of a said 2nd main surface. Method.   The method for manufacturing a solar cell according to claim 6, wherein a width of the second collector electrode is narrower than a width of the third collector electrode.   The method for manufacturing a solar cell according to claim 6, wherein a width of the third collector electrode is narrower than a width of the second collector electrode.   A plurality of current measurement terminals and a plurality of voltage measurement terminals are brought into contact with the first collector electrode and the second collector electrode, respectively, and the characteristic value is measured by a four-terminal method. The manufacturing method of the solar cell as described in any one.   The terminal for current measurement and the terminal for voltage measurement that are in contact with the first collector electrode are pin-like terminals that can be brought into contact with the collector electrode independently, and are in contact with the second collector electrode. The solar cell according to claim 9, wherein the current measurement terminal and the voltage measurement terminal each have a block shape, and the blocks are alternately connected via an insulator. Production method.   The circuit connecting the voltage measuring terminal and the voltmeter is inserted with a resistance higher than the resistance of the first collector electrode and the second collector electrode in contact with the terminal. The manufacturing method of the solar cell of description. The step of measuring the characteristic value of the photoelectric conversion cell,
The block-shaped current measuring terminal and the voltage measuring terminal are continuously brought into contact with the second collector electrode, and the pin-shaped current measuring terminal and the voltage measuring terminal are used as the first collector electrode. A step of discrete contact;
Measuring the characteristic value using the block-shaped current measurement terminal and the voltage measurement terminal, the pin-shaped current measurement terminal and the voltage measurement terminal;
The manufacturing method of the solar cell of Claim 10 provided with these. At least one of the first collector electrode and the second collector electrode is formed by intersecting the finger electrode, the bus bar electrode to which the wiring member is attached when modularized, and the wiring member Outside the range to be arranged, having an auxiliary electrode formed intersecting the finger electrode,
The method of manufacturing a solar cell according to any one of claims 1 to 12, wherein the third collector electrode is formed so as to be connected to the auxiliary electrode and not connected to the bus bar electrode. At least one of the first collector electrode and the second collector electrode is formed from a finger electrode, a bus bar electrode formed so as to intersect the finger electrode, to which a wiring member is attached when modularized, and the bus bar electrode And a connection electrode extending outside the range in which the wiring material is disposed,
The method of manufacturing a solar cell according to any one of claims 1 to 12, wherein the third collector electrode is formed so as to be connected to the connection electrode and not to be connected to the bus bar electrode.   The manufacturing method of the solar cell according to claim 1, wherein the first main surface is a light receiving surface and the second main surface is a back surface.

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