JP3006783B2 - Method of manufacturing solar cell module - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a solar cell module and a method for manufacturing the same.

[0002]

2. Description of the Related Art From the viewpoint of non-depleting properties and non-polluting properties, solar energy is expected to be increasingly used and developed as an alternative energy to fossil energy and nuclear energy. The solar cell, which is a solar power generation device converted into a solar cell, is a typical example of its use mode, and is expected to be widely used in a wide range from general household use to large-scale power generation.

[0003] Among solar cells, the most practically used one is a silicon solar cell. However, silicon as a raw material includes various types such as single crystal, polycrystal, and amorphous. It is manufactured as a module.

[0004] hand, there is a case where the solar cell module is used by using light such as a fluorescent lamp indoors, typically is used outdoors. Solar cell modules used outdoors are required to have sufficient durability against various external environments such as high temperature, low temperature, high humidity, wind and rain. Therefore, a solar cell module for outdoor use is generally configured as roughly divided into a portion in which the solar cell element is sealed and a frame portion.

Here, the portion for sealing the solar cell element is:
A surface protection material and a back surface protection material are bonded to the light receiving surface side and the back surface side, respectively, via an adhesive, thereby sandwiching the solar cell element and the output wiring between the surface protection material and the back surface protection material, In many cases, the laminated body is heated and vacuum-sealed.

The material of the surface protective material of the sealing portion is a flat glass or sheet-like transparent resin having sufficient translucency and mechanical strength, and the material of the back surface protective material is a heat-dissipating material. A sheet in which a high aluminum foil is sandwiched between sheet-like resins from both sides, and a sheet-like EVA (ethylene vinyl acetate) which can be relatively easily thermoset as an adhesive are used. In addition, aluminum, rubber, synthetic resin, or the like that holds the solar cell element and has sufficient strength against wind pressure is often used for the frame portion.

On the other hand, the edge of the portion to be sealed is fitted into a slit-like groove provided in the frame portion. A gap formed between the edge and the groove at the time of the fitting is filled with a filler such as silicon rubber or the like in order to prevent moisture and water vapor from entering.

However, in the conventional solar cell module having the above structure, even if silicon rubber or the like is used as a filler as described above, these have low water absorption but are not sufficiently low in moisture absorption. In addition, it is practically difficult to completely fill the gap formed between the edge of the laminate and the groove of the frame with the filler, and the gap is completely filled. Often not.

As a result, when the usage time of the solar cell module is prolonged, moisture such as raindrops or water vapor enters the gap, and the leaked water increases the leakage current of the solar cell element, There has been a problem that the current collecting electrode may be rusted, or the current collecting electrode and the solar cell element may be separated, resulting in a decrease in the output of the entire solar cell module.

Further, depending on the material of the surface protection material made of a transparent resin or the material of the back surface protection material, the infiltration of moisture from the surface of each protection material cannot be neglected, causing the same problem as the increase in leakage current as described above. The problem caused by such infiltration of moisture is that the infiltrated moisture ionizes the current collecting electrode, and the ions penetrate into a defective portion of the solar cell element below the current collecting electrode, and thus the defective portion is electrically connected. It is conceivable to make it conductive.

[0011] The above problem is caused, for example, by the fact that the adhesive for vacuum lamination penetrates into the voids formed in the current collecting electrode made of conductive powder or the defective portion of the solar cell element under the current collecting electrode. It will be solved if possible, but it is difficult to sufficiently infiltrate commonly used EVA (ethylene vinyl acetate) into the air gap or the defective part, and the air remaining in the vicinity of the current collecting electrode or inside the current collecting electrode is difficult. Complete exclusion is not possible.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a solar cell module capable of preventing the performance of a solar cell element from deteriorating even when used in a bad environment such as outdoors and in a humid atmosphere, and a method for manufacturing the same. The aim is to provide a method .

[0013]

According to the present invention, there is provided a method for manufacturing a solar cell module, comprising: a solar cell element; and a collector electrode having a binder and a conductive member on the solar cell element. Disposing a reactive monomer or a reactive oligomer in which a curing agent is mixed on at least the current collecting electrode on the surface of the solar cell element in the solar cell module having: and drying the reactive monomer or the reactive oligomer by heating And a step of causing

[0014]

Further, a portion of the current collecting electrode provided on the solar cell element, which is not in contact with the solar cell element, is covered with a curable resin composition containing 3% or less of a non-reactive diluent. It is characterized by.

In this case, it is preferable that the resin is provided by coating on the current collecting electrode.

It is desirable that the resin has a number average molecular weight of 3000 or less depending on the structural state of the solar cell element.

[0018]

In [action] solar cell element, a frame provided on the collecting electrode comprising at least a conductive powder resin, when penetrating into the current collecting electrode, the portion serving as laminate for sealing the solar cell element is inserted Even if moisture enters the part of the groove and reaches the vicinity of the solar cell element, it is possible to prevent moisture from invading the empty space of the current collecting electrode. As a result, an increase in leakage current of the solar cell element can be suppressed, and it is possible to prevent the current collecting electrode from being rusted and from separating the current collecting electrode and the solar cell element. In this case, the resin has a number average molecular weight of 300.
By applying a material having a value of 0 or less, the resin can easily penetrate into the inside of the current collecting electrode, and the current collecting electrode is prevented from being ionized and penetrating into a defect of the solar cell element below the current collecting electrode. it can.

[0019]

EXAMPLES hereinafter be described with reference to the accompanying drawings embodiments of the present invention.

( Comparative Example A1) FIG. 1 shows a main part of a laminate 1 according to Comparative Example A1. As shown in the figure, a surface current collecting electrode 20 made of a conductive powder is printed on the surface of the solar cell element 10 in, for example, a paste state by using an appropriate binder. The back surface current collecting electrode 30 may be a conductive substrate or the like, but when formed of a conductive powder, printing is performed in the same manner as the front surface current collecting electrode 20.

Further, at least one of the front surface current collecting electrode 20 and the back surface current collecting electrode 30 has a width larger than the width of the current collecting electrode so that the resin 40 sufficiently penetrates into the current collecting electrode. It is applied in a pattern.

The solar cell element 10 may be made of a material other than silicon, for example, in addition to single crystal silicon, polycrystal silicon, and amorphous silicon.

In the solar cell element 10, a transparent electrode (anti-reflection material) made of, for example, indium tin oxide, indium oxide, tin oxide, or the like may be formed on the light receiving surface. Front collecting electrode 20 and back collecting electrode 30
Typically, a material containing silver as a main component is used, but other materials may be used.

The resin 40, which is an impregnating liquid, is preferably made of a material that easily penetrates into the space between the front surface current collecting electrode 20 and the back surface current collecting electrode 30, such as butyral resin, acrylic resin, polyester resin, etc., but is not limited thereto. Not something. The resin 40 is preferably applied by a screen printing method or a discharging method from a small-diameter nozzle, but other methods may be used.

FIG. 2 is a schematic sectional view schematically showing a cut surface of a main part of the solar cell module. The laminate 1 is obtained by vacuum laminating the solar cell element 10, the front surface current collecting electrode 20, and the back surface current collecting electrode 30 via an adhesive 3, a surface protection material 4, and a back surface protection material 5. 6 is a filler, 7 is a frame part. Sunlight enters from the top of the figure in the direction of the arrow in the figure. Although the wiring and output terminals of the solar cell element 10 are not shown, the output terminals extend from an appropriate portion on the back surface of the laminate 1 to the outside.

Next, the results of experiments comparing the solar cell module configured as described above with the conventional configuration will be described below. In the experiment, two types of solar cell modules were each left in a high humidity state, and the failure of the solar cell element due to the invasion of water vapor from the outside and the electrical short circuit of the entire solar cell module were examined.

<Experimental Example 1-1> First, Experimental Example 1-1 will be described. Solar cell element 10
Was prepared as follows. First, n, i, p, n, i, and p-type amorphous silicon thin films were sequentially laminated on a stainless steel substrate from the substrate side by using an RF glow discharge method. Next, indium tin oxide was vapor-deposited on the thin film as a transparent electrode, and then silver paste was screen-printed in a grid shape as a surface current collecting electrode 20. further,
In the same pattern as the surface current collecting electrode 20, a resin 40 is applied on the current collecting electrode by screen printing using a screen plate having a wide grid width, and the resin 40 is applied to the empty space of the silver paste as the current collecting electrode 20. Was infiltrated.

As the solar cell element 10, one formed in this way (30 cm in length and 9 cm in width) was used as one unit, and the one unit was used in serial connection in 13 stages.

The deposition of the amorphous silicon thin film as the transparent electrode was performed as follows. First, the substrate was placed in a previously set chamber, and the inside of the chamber was set to a discharge space atmosphere. For the discharge space atmosphere, for example, a gas as a raw material for an n-type amorphous silicon thin film is introduced, the pressure in the chamber is controlled to about 2 Torr, and RF high-frequency power is supplied to the electrodes in the chamber to induce discharge. It was obtained by letting it do. The n-type amorphous silicon thin film was formed by decomposing the gas introduced into the chamber by the discharge and depositing it on the substrate.

By repeating this procedure, n,
An i, p, n, i, p-type amorphous silicon thin film was deposited on the substrate. As a gas serving as a raw material of the amorphous silicon thin film, an n-type gas uses Si ₂ H ₆ , H ₂ , PH ₃ and i
Si ₂ H ₆ and H ₂ were used for the type, and SiH ₄ , H ₂ and BF ₃ were used for the p type. The temperature of the substrate when depositing the amorphous silicon thin film was controlled to about 350 ° C. for n-type and i-type, and to about 300 ° C. for p-type.

The above-mentioned vacuum deposition of the transparent electrode was carried out in the following steps by using an alloy of 50% each of indium and tin as a deposition material. The substrate on which the amorphous silicon thin film is laminated and the crucible filled with the alloy are placed in a previously installed chamber, and oxygen gas is introduced to control the pressure in the chamber to about 0.003 Torr. An alloy was melted by passing a current through a tungsten wire wound around the periphery, and indium tin oxide was deposited on the surface of the amorphous silicon thin film laminated on the substrate.

The temperature of the substrate during this deposition was controlled at about 225 ° C. In addition, in this comparative example, indium tin oxide was used as the transparent electrode, but the material is not limited to this, and may be, for example, indium oxide. Further, the vapor deposition is not limited to the vacuum vapor deposition, and may be, for example, sputtering or the like.

Screen printing of the surface current collecting electrode 20 was performed using a screen stencil having a grid-like pattern with a width of 300 μm prepared in advance and using a normal screen printing machine. The surface current collecting electrode 20 used was a silver paste manufactured by DuPont diluted with carbitol acetate. The silver paste screen-printed on indium tin oxide was thermally cured at about 150 ° C. for about 1 hour using a drying oven. In 1 of Experimental Example 1, as an index indicating the degree of vacancy after the thermal effect of the silver paste,
A pore volume of 0.1 μm or more in diameter per unit weight obtained by pore volume analysis by mercury porosimetry was used.

A resin 40 was further applied to the surface current collecting electrode 20 by screen printing. The screen printing of the resin 40 was performed using a scoon plate having a grid-like pattern with a width of 500 μm in the same pattern as the pattern of the surface current collecting electrode prepared in advance, using a normal screen printing machine. As the resin 40, a butyral resin diluted with a 10% solution of methyl ethyl ketone was used.

The pattern of the impregnating liquid as the resin 40 was adjusted so that the center line of the grid-shaped portion was within 50 μm of the pattern of the surface current collecting electrode 20. The butyral resin screen-printed on the silver paste was dried by heating at about 100 ° C. for about 0.5 hour using a drying oven.

The butyral resin as the resin 40 had a thickness of 10 μm. The pore volume, which is an index indicating the degree of vacancy of the silver paste after the butyral resin is applied, penetrated and dried by heating, is reduced to about 1/5 as compared with the case where the butyral resin is not penetrated. I understood that.

The solar cell element 10, the transparent electrode, the surface current collecting electrode 20, and the resin 40 manufactured as described above were vacuum-laminated to obtain a laminate 1 as follows.

As the adhesive layer 3 used in the vacuum lamination, a sheet-like EVA is used. As the surface protective material 4, a sheet-like Tefzel made of a DuPont fluororesin having a thickness of 100 μm is used. As material 5,
A sheet was used in which an aluminum foil was sandwiched between both sides of a sheet-like white Tedlar made of a fluororesin manufactured by DuPont.

The laminate 1 is laminated on the back surface protective material 5, the adhesive layer 3, the solar cell element 10, and transparent. In this case, in order to place the solar cell module under actual use conditions outdoors, the inside of the chamber is required. It is necessary to irradiate the solar cell module in the chamber with light instead of just leaving it alone.

However, since a solar cell using amorphous silicon as a raw material has a so-called light deterioration effect, it is known that the electric performance of a solar cell module is reduced by light irradiation. In this experiment, in order to distinguish the effect of the photodeterioration on the solar cell module from the effect on the solar cell module due to the intrusion of moisture from the outside, which is a problem in the present invention, the light was applied to the solar cell module in the chamber. Was not irradiated. Instead, during the experiment, a DC voltage of about 13 V corresponding to the light irradiation state was continuously applied to each solar cell module from the output terminal in the forward direction of the diode component of each solar cell module.

In the chamber of the above-mentioned environmental test apparatus, ten solar cell modules of the two types prepared above were placed horizontally so that the light-receiving surface was directed upward and the interval between them was about 10 cm. , Temperature in the chamber 50 ℃,
85% R.H. It was left for 500 hours continuously while being controlled at H.

After the elapse of 500 hours, each solar cell module was taken out of the environmental test apparatus, and water droplets and moisture adhering to the surface were wiped off with a cloth. The electrical performance of each solar cell module was measured at room temperature. The simulated sunlight at the time of the measurement was AM 1.5 GROBAL, and the intensity was 100 mW / cm ² .

As a result, in the conventional solar cell module in which the resin 40 has not penetrated the surface current collecting electrode 20,
There were 6 modules out of 10 modules whose output decreased by 10% or more or showed an electrically short-circuit state. On the other hand, in the case of Example 1 of Experimental Example 1 in which butyral resin 40 was infiltrated into the surface current collecting electrode 20, only one out of ten modules showed the same output decrease and short-circuit state, and only The effect of applying the resin 40 to the electrode 20 was proved.

<Experimental Example 1-2> Next, Experimental Example 1-2 will be described. In Test Example 1 and 2, the material of the resin 40 to be permeated into the surface current collecting electrode 20 was acrylic resin, which was ejected from a small-diameter nozzle, applied by injection, and permeated.

The acrylic resin used as the resin 40 was diluted with a 20% solution of toluene. The nozzle used for injection coating of acrylic resin has a diameter of 100 μm,
The coating was performed on the surface current collecting electrode 20 by moving the nozzle in the same pattern as the surface current collecting electrode.

The thickness of the acrylic resin after heating and drying is 5
μm. When the acrylic resin was applied, penetrated, and dried by heating, the silver paste was examined by the pore volume, which is an index indicating the degree of vacancy of the silver paste. I understood that. A solar cell module having such a configuration is
This was produced. Other configurations are the same as those of the above-mentioned Experimental Example 1.

Separately from the solar cell module according to Experiment Example 1-2, ten solar cell modules having a conventional configuration were produced in the same manner as in Experiment Example 1-1. Also,
The solar cell module according to Experimental Example 1-2 is the same as that in Experimental Example 1.
As in the case of No. 1, it was left for about 3 days until the filler 6 was completely dried and fixed.

For each of the above two types of solar cell modules, a comparative trial experiment was conducted to examine the effect of this experimental example using the same apparatus as in Experimental Example 1 and using the same procedure.

As a result, in the solar cell module in which the acrylic resin as the resin 40 is not penetrated into the surface current collecting electrode 20, the output is reduced by 10% or more, or the solar cell module showing an electrical short-circuit state is out of 10 modules. There were 7 modules. On the other hand, as for the module in which the acrylic resin is applied to the surface current collecting electrode 20, the same output decrease and short-circuit state are shown in only 3 out of 10 modules. The effect of applying was demonstrated.

<3 of Experimental Example 1> Next, 3 of Experimental Example 1 will be described. In this experimental example, the material of the resin 40 to be penetrated into the surface current collecting electrode 20 was a polyester resin, which was applied using screen printing.

The resin 4 applied to the surface current collecting electrode 20
The screen printing of No. 0 was performed using a screen printing plate having a grid pattern with a width of 500 μm in the same pattern as the pattern of the surface current collecting electrode prepared in advance, using a normal screen printing machine.

As the resin 40, a polyester resin diluted with a 20% solution of ethyl acetate was used. The pattern of the resin 40 is such that the center line of the grid-shaped portion is the surface current collecting electrode 2.
The pattern was matched to the pattern of 0 so as to fall within 50 μm.

The polyester resin screen-printed on the silver paste was heated to about 100 ° C. using a drying oven.
For about 0.5 hours. The thickness of the polyester resin was 20 μm. A comparison result of the pore volume, which is an index indicating the degree of vacancy of the silver paste after applying and infiltrating a polyester resin and heating and drying,
In the case of the solar cell module according to 3 of Experimental Example 1, it was found that the solar cell module was reduced to about 1/3 as compared with the conventional configuration in which the polyester resin did not penetrate.

[0059] Ten solar cell modules according to Experimental Example 1-3 were prepared. Other configurations of the solar cell module according to Experimental Example 1-2 are the same as those of Experimental Example 1-1.

Separately from the solar cell module according to Experimental Example 1-3, 10 solar cell modules having a conventional configuration were manufactured in the same manner as in Experimental Example 1-1. Further, the solar cell module according to Experimental Example 1-3 was left for about 3 days until the filler 6 was completely dried and fixed, as in the case of Experimental Example 1-1.

For each of the above two types of solar cell modules, using the same apparatus as in Experiment Example 1 and in the same procedure,
A comparative trial experiment was conducted to examine the effect of this experimental example.

As a result, in the case of the large intestine battery module in which the polyester resin as the resin 40 is not penetrated into the surface current collecting electrode 20, the output is reduced by 10% or more, or the electrical short-circuit state is indicated by 10 modules. There were 6 modules. On the other hand, as for the module in which the resin 40 was applied to the surface current collecting electrode 20, the same output decrease and short-circuit state were shown in only 3 out of 10 modules. The effect of the infiltration was demonstrated.

( Comparative Example A2) Next , a laminate 1 according to Comparative Example A2 will be described. Book
The comparative example is the surface current collecting electrode resin 2 in the comparative example A1.
0, a resin 40 having a number-average molecular weight of 3000 or less in at least one of the back surface current collecting electrodes 30 in a pattern wider than each of the current collecting electrodes, and sufficiently penetrates inside the current collecting electrodes. Applied to FIG. 3 shows a state where the resin 40 has penetrated.

Here, the impregnating liquid, which is the resin 40 having the number average molecular weight, easily penetrates into the space between the front surface current collecting electrode 20 and the back surface current collecting electrode 30. Or a urethane resin dissolved in a 50% solution of ethyl acetate, or a phenol resin dissolved in a 50% solution of isopropyl alcohol.
It is desirable to use one dissolved in a 0% solution, but it is not limited thereto.

Further, the application of the resin 40 is performed in the first ratio.
Similar to compare example, a method of performing by ejecting from a screen printing method or the small-diameter nozzle is desired, it may use other techniques.

Next, similarly to the experimental examples of Comparative Example A1, the solar cell module according to each experimental example of Comparative Example A2 and the conventional solar cell module were left in a high humidity state, respectively, and were exposed to external Experimental results obtained by examining the failure of the solar cell element due to the intrusion of water vapor and the electrical short-circuit state of the entire solar cell module will be described below. Unless otherwise specified, the same experimental conditions as those in Examples 1 to 3 in Comparative Example A1 will not be described.

<1 of Experimental Example 2> First, 1 of Experimental Example 2 will be described. As the resin 40, a material obtained by diluting an epoxy resin with a 50% solution of methyl ethyl ketone was used. The number average molecular weight of the epoxy resin alone is 3
00. Note that the method of producing the print pattern of the resin 40 is the same as that of the comparative example A1.

The epoxy resin screen-printed on the silver paste as the surface current collecting electrode 20 was dried by heating at about 100 ° C. for about 0.5 hour using a drying oven. The thickness of the epoxy resin was 10 μm. Also, when the silver paste coated with the impregnating liquid was forcibly peeled off from above the solar cell element using an adhesive tape and the surface of the solar cell element was observed with a microscope, the epoxy resin remained under the silver paste. I understand that The residual amount of epoxy resin per unit area was about 80%.

Twenty solar cell modules according to the present Experimental Example 1 were manufactured, and twenty solar cell modules having a conventional configuration were manufactured to compare the experimental results. The conventional solar cell module had the same configuration as the solar cell module according to this comparative example except that the epoxy resin having the number average molecular weight was provided on the surface current collecting electrode 20.

In the chamber of the environmental test apparatus used in each experimental example of the comparative example A1, 20 solar cell modules of two types manufactured for one of the experimental example 2 were placed so that the light-receiving surface faces upward. Installed horizontally so that each space is about 10cm, chamber temperature 50 ℃, relative humidity 85%
R. H and left for 500 hours continuously.

After a lapse of 500 hours, these solar cell modules were taken out of the environmental test apparatus, and the above-mentioned comparative example A
The electrical performance of each solar cell module was measured at room temperature in the same manner as in each of the experimental examples of Example 1.

As a result, among the solar cell modules in which the resin was not applied to the surface current collecting electrodes, 13 out of 20 modules showed an output lowering by 10% or more or showed an electrically short-circuited state. On the other hand, the solar cell module according to 1 of Experimental Example 2 was only one module out of 20 modules. That is, the effect of applying the epoxy resin having the number average molecular weight to the surface current collecting electrode 20 was proved.

<Experimental Example 2-2> Next, Experimental Example 2-2 will be described. Comparative Example 2-2
In the above, a resin obtained by dissolving a urethane resin with a 50% solution of ethyl acetate was used as the resin 40 applied to the surface current collecting electrode 20. The number average molecular weight of the urethane resin is 1,000.

The resin 40 was applied by screen printing in the same manner as in Experimental Example 1 above. Here, the urethane resin screen-printed on the silver paste as the surface current collecting electrode 20 was dried by heating at about 100 ° C. for about 0.5 hour using a drying oven. The thickness of the urethane resin after heating and drying was 5 μm. The surface current collecting electrode 20 to which the resin 40 was applied was forcibly peeled off from the solar cell element 10 using an adhesive tape, and the surface of the solar cell element 10 was observed with a microscope. It was found that the resin remained. The residual amount of the urethane resin per unit area was about 70%.

In this way, 20 solar cell modules according to Experimental Example 2-2 were manufactured, and 20 solar cell modules having a conventional configuration were manufactured to compare the experimental results. The conventional solar cell module had the same configuration as the solar cell module according to Experimental Example 2-2 except that the urethane resin having the number average molecular weight was provided on the surface current collecting electrode 20.

Each of the above two types of modules was used in Example 2 of Experimental Example 2.
A comparative trial experiment for examining the effect of 2 of Experimental Example 2 was performed using the same apparatus as in the above and in the same procedure.

As a result, in the solar cell modules having the conventional configuration, 14 out of 20 modules whose output decreased by 10% or more or showed an electrically short-circuited state. On the other hand, in the solar cell module according to Test Example 2-2, 4 out of 20 modules showed the effect of applying the urethane resin having the number average molecular weight.

<Experimental Example 2-3> Finally, Experimental Example 2-3 according to Comparative Example A2 will be described. In Experimental Example 2-3, as the resin 40 applied to the surface current collecting electrode 20, a phenol resin having a number average molecular weight of 3000 or less diluted with a 50% solution of isopropyl alcohol was used.

The silver paste serving as the surface current collecting electrode 20 coated with the resin 40 was forcibly peeled off from above the solar cell element using an adhesive tape, and the surface of the solar cell element was observed with a microscope. It was found that phenol resin remained. The residual amount of the phenol resin per unit area was 20%.

In this way, 20 solar cell modules according to Experimental Example 2-3 were manufactured, and 20 solar cell modules having a conventional configuration were manufactured to compare the experimental results. The solar cell module having the conventional configuration had the same configuration as the solar cell module according to Experimental Example 2-3 except that the phenol resin having the number average molecular weight was provided on the surface current collecting electrode 20.

Each of the above two types of modules was used in Example 1 of Experimental Example 2.
A comparative trial experiment was conducted to examine the effects of the experimental examples by using the same apparatus and by the same procedure.

As a result, in the large intestine battery module having the conventional configuration, 12 out of 20 modules whose output decreased by 10% or more or showed an electrically short-circuit state existed. On the other hand, in the solar cell module according to Experimental Example 2-3, only 8 out of 20 modules showed the same state, and the surface current collecting electrode 20 was coated with the phenol resin having the above number average molecular weight. The effect by was demonstrated.

[0083] (Embodiment A3) present example, as 40 in FIG. 1 showing a comparative example A1,
A non-reactive diluent is 3% or less, and a curable resin composition diluted with a reactive monomer or oligomer is used.
Other points are the same as in Comparative Example A 1.

<Experimental Example 3-1> An experimental example 3-1 will be described. The fabrication of the solar cell element 10 is the same as that of the first experimental example.

In this example, the curable resin 40 was applied to the surface current collecting electrode 20 by screen printing. The screen printing of the curable resin 40 was performed using a screen screen having a grid pattern with a width of 500 μm in the same pattern as the pattern of the surface current collecting electrode prepared in advance, using a normal screen printing machine. As the material of the curable resin 40, a mixture of acrylate / urethane / oligomer at a curing agent di-tbutyl peroxide weight ratio of 100: 2 was used. The number average molecular weight of the acrylate / urethane / oligomer alone is 250.

The printing pattern of the curable resin was adjusted so that the center line of the grid-shaped portion was within 50 μm of the pattern of the surface current collecting electrode 20. Acrylate urethane screen-printed on the silver paste
The oligomer was heated and dried at about 100 ° C. for about 0.5 hour using a drying oven.

The acrylate urethane oligomer is
Its thickness was 10 μm. As an index indicating the degree of vacancy of the silver paste after applying the acrylate urethane oligomer and drying by heating, when examined by mercury porosimetry pore volume, when the acrylate urethane oligomer is not applied It was found that the ratio was reduced to about 1/10.

Otherwise, 40 solar cell modules were prepared in the same manner as in Experimental Example 1.

The same test as in Experimental Example 1 was carried out for 40 solar cell modules.

One module out of 40 modules whose output was reduced by 10% or more or was electrically short-circuited.

<Experimental Example 3-2> In Experimental Example 3-2, a resin 40 in which acrylate / urethane / oligomer and a curing agent di-tbutyl peroxide were mixed at a weight ratio of 100: 2 was used. In other respects, 40 solar cell modules were prepared in the same manner as in Experimental Example 3.

When a test similar to 1 of Experimental Example 3 was performed, the output decreased by 10% or more, or 4 out of 40 modules showed an electrical short circuit.

[0093]

[0094]

[0095]

As described above, according to the present invention,
Is formed on at least one side of the front surface and the rear surface of the solar cell element, the anti on the collector electrode of at least the conductive powder
Because a highly responsive monomer or oligomer is located,
Monomers or oligomers are sufficient for emptying in the collecting electrode
Can penetrate, and then reacts with the curing agent to cure
Since the empty space is filled, when the laminate, which is the portion that seals the solar cell element, is inserted into the groove of the frame portion, moisture penetrates from the vicinity of the insertion groove through the end of the laminate to the vicinity of the solar cell element. Even if it reaches, it is possible to prevent the intrusion of moisture into the empty space of the current collecting electrode, so that the leakage current of the solar cell element increases, or the current collecting electrode is rusted,
The current collector electrode and the solar cell element can be prevented from peeling off, and sufficient reliability can be ensured even in long-term use of the solar cell module in a bad environment such as outdoors.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a main part of a laminate according to Comparative Example A1.

FIG. 2 is a cross-sectional view illustrating a configuration of a solar cell module.

FIG. 3 is a cross-sectional view schematically illustrating a main part of a laminate according to Comparative Example A2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 solar cell element, 20 front surface current collection electrode, 30 back surface current collection electrode, 40 resin, 1 laminated body, 3 adhesive layers, 4 surface protection material, 5 back surface protection material, 6 filler, 7 frame part.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-239377 (JP, A) JP-A-54-7638 (JP, A) JP-A-54-7639 (JP, A) JP-A-63-63 246878 (JP, A) JP-A-60-158633 (JP, A) JP-A-61-26663 (JP, A)

Claims (3)

(57) [Claims] Claims: 1. A curing agent is provided on at least a current collecting electrode on a surface of a solar cell element in a solar cell module having a solar cell element and a current collecting electrode having a binder and a conductive member on the solar cell element. A method for manufacturing a solar cell module, comprising: disposing a mixed reactive monomer or reactive oligomer; and heating and drying the reactive monomer or reactive oligomer. 2. The method according to claim 1, wherein the reactive oligomer comprises an acrylic oligomer. 3. The method according to claim 2, wherein the acrylic oligomer comprises an acrylate urethane oligomer.
3. The method for manufacturing a solar cell module according to item 1.