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JP3689088B2 - Particle deposition layer forming device - Google Patents
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JP3689088B2 - Particle deposition layer forming device - Google Patents

Particle deposition layer forming device Download PDF

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Publication number
JP3689088B2
JP3689088B2 JP2003046232A JP2003046232A JP3689088B2 JP 3689088 B2 JP3689088 B2 JP 3689088B2 JP 2003046232 A JP2003046232 A JP 2003046232A JP 2003046232 A JP2003046232 A JP 2003046232A JP 3689088 B2 JP3689088 B2 JP 3689088B2
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particle
substrate
conductive member
particles
discharge tube
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JP2004256841A (en
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尚文 平岡
功 松井
善昭 中村
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Toshiba Corp
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Toshiba Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、粒子堆積層形成装置に関する。
【0002】
【従来の技術】
ナノメートルスケールの粒子は、従来の粒子にない様々な特徴を有している。そのため、近年、ナノメートルスケールの粒子を電子デバイス等へ応用すべく、半導体などからなるナノメートルスケールの粒子を基板表面の一部の領域に吸着させて所定のパターンの粒子堆積層を形成する試みが行われている。(以下の特許文献1を参照のこと。)
粒子を基板表面の一部の領域に吸着させる方法としては、予め基板表面に帯電状態の分布を形成しておき、帯電粒子と基板表面との間の静電力を利用する方法がある。具体的には、例えば、まず、粒子生成装置で生成した粒子を窒素などのキャリアガスとともにコロナ放電などを利用した帯電装置に供給し、正または負に帯電させる。次いで、正または負に帯電した荷電粒子をキャリアガスとともに粒子吐出管を介して基板表面に供給する。この際、予め基板表面に粒子吐出管から吐出される荷電粒子とは逆極性の帯電部を形成しておくことにより、帯電粒子を帯電部上に吸着させることができる。
【0003】
この方法によれば、理想的には、帯電粒子を帯電部上のみに吸着させることができるものと考えられる。しかしながら、現実には、帯電粒子は非帯電部にも吸着してしまう。
【0004】
【特許文献1】
国際公開第01/84238A1号パンフレット
【0005】
【発明が解決しようとする課題】
本発明の目的は、基板表面のうち帯電部に対して高い選択性で粒子を吸着させることが可能な粒子堆積層形成装置を提供することにある。
【0006】
【課題を解決するための手段】
本発明によると、粒子を生成する粒子生成装置と、前記粒子生成装置で生成した前記粒子を帯電させる帯電装置と、基板を保持可能なホルダと、内面が電気的に絶縁性であり且つ一方の開口に前記帯電装置により帯電させられた前記粒子がキャリアガスとともに供給されるとともに他方の開口から前記基板に向けて前記粒子を前記キャリアガスとともに吐出する粒子吐出管と、前記粒子吐出管の前記基板側端部外周に設けられた導電性部材と、前記導電性部材の電位を一定に制御する制御手段とを具備し、前記導電性部材は鍔状部を備えていることを特徴とする粒子堆積層形成装置が提供される。
【0007】
本発明において、制御手段は、導電性部材とホルダとを同電位とするように構成されていてもよい。或いは、制御手段は、導電性部材の電位を複数の値の間で切り替え可能に構成されていてもよい。
【0008】
導電性部材は、粒子吐出管の基板側の端面を覆っていてもよい。或いは、導電性部材の基板側の面と基板との間の距離は、粒子吐出管の基板側の端面と基板との間の距離よりも短くてもよい
【0009】
【発明の実施の形態】
以下、本発明の実施形態について、図面を参照しながら詳細に説明する。なお、各図において、同様または類似する構成要素には同一の参照符号を付し、重複する説明は省略する。
【0010】
図1は、本発明の第1の実施形態に係る粒子堆積層形成装置を概略的に示す図である。この粒子堆積層形成装置1は、粒子生成装置2、冷却装置3、帯電装置4、粒子移送管5、粒子吐出管6、導電性部材7、ホルダ8、及び制御手段9を備えている。
【0011】
粒子生成装置2は、ナノメートルスケールの粒子を生成可能なものであれば特に制限はない。但し、粒子吐出管6からは粒子をキャリアガスとともに吐出するので、粒子堆積層形成装置1の構成を簡略化する観点では、粒子生成装置2はCVD(Chemical Vapor Deposition)法などの気相法により粒子を生成するものであることが有利である。なお、ここでは、一例として、粒子生成装置2が気相法により粒子を生成するものであることとする。
【0012】
冷却装置3は、例えば冷却ジャケットなどを備えており、粒子移送管5を介して窒素などのキャリアガスとともに帯電装置4へと供給される粒子を冷却する。この冷却装置3は、粒子生成装置2が十分に冷却された粒子やキャリアガスを排出する場合などには設けなくてもよい。
【0013】
帯電装置4は、粒子生成装置2で生成した粒子を正または負に帯電させるものである。帯電装置4としては、例えば、コロナ放電などを利用したものを使用することができる。
【0014】
粒子吐出管6は、帯電装置4により正または負に帯電した粒子をキャリアガスとともに吐出する。この粒子吐出管6の内面は電気的に絶縁性である。
【0015】
導電性部材7は、粒子吐出管6を外側から取り囲むように設けられている。導電性部材7は、粒子吐出管6の外面全体を覆っていてもよいが、図1に示すように、粒子吐出管6のホルダ8側端部外周に設けられていればよい。導電性部材7は、粒子吐出管6の外面に設けられた導電膜であってもよく、或いは、それ自体を独立して取り扱うことが可能な管であってもよい。後者の場合、粒子吐出管6は導電性部材の内面に設けられた絶縁膜であってもよい。なお、導電性部材7の構造については、後で詳述する。
【0016】
ホルダ8は、基板10が粒子吐出管6の吐出口に向き合うように基板10を着脱可能に保持している。ホルダ8の基板10を保持する保持面は、例えば、導電体で構成することができる。
【0017】
制御手段9は、導電性部材7の電位を一定に制御する。典型的には、制御手段9は、導電性部材7の電位を予め定められた設定値に維持する。制御手段9は、導電性部材7の電位を複数の値の間で切り替え可能なものであってもよく、或いは、そのような切り替えが不可能なものであってもよい。
【0018】
制御手段9は、維持すべき電圧を複数の値の間で切り替え可能な定電圧装置を備えていてもよく、そのような切り替えが不可能な定電圧装置を備えていてもよい。また、制御手段9により導電性部材7の電位を接地電位と等しくしてもよい。すなわち、制御手段9は、導電性部材7と大地とを接続する導電パスを構成している部材を備えていてもよい。なお、ホルダ8の保持面は、接地して接地電位に維持してもよく、或いは、制御手段9に接続して所望の電位に維持してもよい。
【0019】
図2は、図1の粒子堆積層形成装置1で採用可能な構造の一例を概略的に示す断面図である。図2に示す導電性部材7は粒子吐出管6の基板10側端部外周に設けられており、基板10側に向いた導電性部材7の端面と粒子吐出管6の端面とは同一平面上にある。なお、図2では、一例として、導電性部材7は接地されている。また、ここでは、一例として、粒子吐出管6から吐出される粒子11は負に帯電し、基板10の表面には所定のパターンに正電荷の分布が形成されていることとする。
【0020】
このような構成によると、基板10の表面のうち帯電部に対して高い選択性で粒子を吸着させることが可能となる。これについては、図2と図3(a),(b)とを対比しながら説明する。
【0021】
図3(a),(b)は、比較例に係る粒子堆積層形成装置で採用される粒子吐出管の構造を概略的に示す断面図である。
【0022】
図3(a)に示す構造では、粒子吐出管6を導電体で構成している。また、図3(a)に示す構造では、安全のため、粒子吐出管6を接地している。図3(a)に示す構造によると、帯電装置4により負に帯電させられた粒子11は、粒子吐出管6を通過する間にその内壁と衝突すると、粒子吐出管6に電子を奪われる。そのため、粒子11と基板10の表面に形成された帯電部との間の静電引力が弱められる。その結果、粒子11を帯電部上のみに吸着させることができず、粒子11は非帯電部にも吸着してしまう。
【0023】
図3(b)に示す構造では、粒子吐出管6を絶縁体で構成している。図3(b)に示す構造によると、帯電装置4により負に帯電させられた粒子11が粒子吐出管6を通過する間にその内壁と衝突すると、粒子11は粒子吐出管6に電子を奪われ、その結果、粒子吐出管6の内壁は負に帯電する。粒子吐出管6の内壁が十分に帯電すると、粒子吐出管6の内壁と負に帯電させられた粒子11との間に働く静電斥力により、粒子11の粒子吐出管6への衝突が抑制される。そのため、図3(b)に示す構造によると、粒子11の電荷が粒子吐出管6に奪われるのを抑制することができる。しかしながら、図3(b)に示す構造では、負に帯電した粒子吐出管6と基板10の表面に形成された帯電部との間に強い電界12が生じる。そのため、図3(b)に示す構造でも、粒子11を帯電部上のみに吸着させることができず、粒子11は非帯電部にも吸着してしまう。
【0024】
これに対し、図2に示す構造では、電気的に絶縁性の粒子吐出管6を使用している。そのため、粒子11の電荷が粒子吐出管6に奪われるのを抑制することができる。しかも、図2に示す構造では、粒子吐出管6の基板10側端部外周に導電性部材7が設けており、この導電性部材7を接地している。そのため、粒子吐出管6と導電性部材7との間に強い電界12を生じるものの、粒子吐出管6と基板10の表面に形成された帯電部との間に強い電界を生じることはない。したがって、図2に示す構造によると、粒子11を帯電部上のみに吸着させることができる。すなわち、図2に示す構造によると、基板10の帯電部に対して高い選択性で粒子11を吸着させることが可能となる。
【0025】
本実施形態において、導電性部材7の構造には様々な変形が可能である。
図4(a)乃至(d)は、図1の粒子堆積層形成装置1で導電性部材7に採用可能な構造の他の例を概略的に示す断面図である。
【0026】
図4(a)に示す構造では、導電性部材7は粒子吐出管6の基板10側の端面を覆っている。この構造によると、図2に示す構造に比べ、粒子吐出管6と基板10の表面上の帯電部との間に強い電界が生じるのを抑制する効果が大きい。したがって、この構造を採用すると、基板10の帯電部に対してより高い選択性で粒子11を吸着させることが可能となる。
【0027】
図4(b)に示す構造では、導電性部材7の基板10側の面と基板10との間の距離は、粒子吐出管6の基板10側の端面と基板10との間の距離よりも短い。この構造も、図2に示す構造に比べ、粒子吐出管6と基板10の表面上の帯電部との間に強い電界が生じるのを抑制する効果が大きい。したがって、この構造を採用すると、基板10の帯電部に対してより高い選択性で粒子11を吸着させることが可能となる。
【0028】
図4(c)に示す構造では、導電性部材7は粒子吐出管6の基板10側端部を取り囲んだ鍔状部を備えている。この構造も、図2に示す構造に比べ、粒子吐出管6と基板10の表面上の帯電部との間に強い電界が生じるのを抑制する効果が大きい。したがって、この構造を採用すると、基板10の帯電部に対してより高い選択性で粒子11を吸着させることが可能となる。
【0029】
図4(d)に示す構造では、導電性部材7は粒子吐出管6の基板10側端部近傍に鍔状部を備えている。加えて、図4(d)に示す構造では、導電性部材7は粒子吐出管6の基板10側の端面を覆っている。この構造も、図2に示す構造に比べ、粒子吐出管6と基板10の表面上の帯電部との間に強い電界が生じるのを抑制する効果が大きい。したがって、この構造を採用すると、基板10の帯電部に対してより高い選択性で粒子11を吸着させることが可能となる。
【0030】
図5(a)は図1に示す粒子堆積層形成装置1の導電性部材7に図4(d)に示す構造を採用した場合の等電位面の一例を示す図である。また、図5(b)は図3(a)に示す構造を採用した場合の等電位面の一例を示す図である。なお、図5(a)に示すデータは導電性部材7を接地した場合を想定して得られたものである。また、図5(b)に示すデータは粒子吐出管6の電位を−2kVに維持した場合に得られたものである。
【0031】
図5(a)及び(b)に示すように、導電性部材7に図4(d)に示す構造を採用した場合、図3(a)に示す構造を採用した場合に比べ、粒子吐出管6と基板10との間の電界が弱い。この例では、導電性部材7に図4(d)に示す構造を採用した場合、図3(a)に示す構造を採用した場合に比べ、粒子吐出管6と基板10との間の電界は1/10程度に抑制されている。
【0032】
このように、本実施形態によると、粒子吐出管6と基板10の表面に形成された帯電部との間に強い電界を生じることがないため、基板10の帯電部に対して高い選択性で粒子11を吸着させることが可能となる。
【0033】
本実施形態では、導電性部材7の電位を適宜設定することにより、粒子吐出管6から吐出される粒子11の速度を制御することができる。例えば、導電性部材7の極性が粒子11の帯電極性とは逆となるように導電性部材7の電位を設定すると、導電性部材7と粒子11との間に静電引力を生じさせることができる。したがって、粒子11の速度を遅くすることができる。
【0034】
また、本実施形態では、粒子生成装置2と粒子吐出管6との間に分級装置を設けてもよい。これにより、所望の粒径の粒子11を基板10上に吸着させることができる。
【0035】
次に、本発明の第2の実施形態について説明する。
図6は、本発明の第2の実施形態に係る粒子堆積層形成装置を概略的に示す図である。本実施形態は、一部の粒子11を正に帯電させ且つ他の粒子11を負に帯電させる帯電装置4,例えばアメリシウム等の放射性物質が放出するα線により気体を電離させるもの,を使用するとともに、粒子11を帯電極性などに応じて分級する分級装置15を設けること以外は第1の実施形態と同様である。このような構成を採用した場合も、第1の実施形態で説明したのと同様の効果を得ることができる。
【0036】
【発明の効果】
以上説明したように、本発明によると、基板表面のうち帯電部に対して高い選択性で粒子を吸着させることが可能な粒子堆積層形成装置が提供される。
【図面の簡単な説明】
【図1】本発明の第1の実施形態に係る粒子堆積層形成装置を概略的に示す図。
【図2】図1の粒子堆積層形成装置で採用可能な構造の一例を概略的に示す断面図。
【図3】(a),(b)は、比較例に係る粒子堆積層形成装置で採用される粒子吐出管の構造を概略的に示す断面図。
【図4】(a)乃至(d)は、図1の粒子堆積層形成装置で導電性部材に採用可能な構造の他の例を概略的に示す断面図。
【図5】(a)は図1に示す粒子堆積層形成装置の導電性部材に図4(d)に示す構造を採用した場合の等電位面の一例を示す図、(b)は図3(a)に示す構造を採用した場合の等電位面の一例を示す図。
【図6】本発明の第2の実施形態に係る粒子堆積層形成装置を概略的に示す図。
【符号の説明】
1…粒子堆積層形成装置、2…粒子生成装置、3…冷却装置、4…帯電装置、5…粒子移送管、6…粒子吐出管、7…導電性部材、8…ホルダ、9…制御手段、10…基板、11…粒子、12…電界、15…分級装置。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a particle deposition layer forming apparatus.
[0002]
[Prior art]
Nanometer-scale particles have various characteristics not found in conventional particles. Therefore, in recent years, in order to apply nanometer-scale particles to electronic devices, etc., an attempt is made to form a particle deposition layer with a predetermined pattern by adsorbing nanometer-scale particles made of semiconductor or the like to a part of the substrate surface. Has been done. (See Patent Document 1 below.)
As a method for adsorbing particles to a partial region of the substrate surface, there is a method in which a distribution of a charged state is formed in advance on the substrate surface and an electrostatic force between the charged particles and the substrate surface is used. Specifically, for example, first, particles generated by the particle generation device are supplied to a charging device using corona discharge or the like together with a carrier gas such as nitrogen and charged positively or negatively. Next, charged particles that are positively or negatively charged are supplied to the substrate surface through a particle discharge tube together with a carrier gas. At this time, the charged particles can be adsorbed onto the charging portion by forming a charging portion having a polarity opposite to that of the charged particles discharged from the particle discharge tube in advance on the substrate surface.
[0003]
According to this method, ideally, it is considered that the charged particles can be adsorbed only on the charged portion. However, in reality, the charged particles are also adsorbed to the non-charged portion.
[0004]
[Patent Document 1]
International Publication No. 01 / 84238A1 Pamphlet [0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a particle deposition layer forming apparatus capable of adsorbing particles with high selectivity to a charged portion of a substrate surface.
[0006]
[Means for Solving the Problems]
According to the present invention, a particle generating device that generates particles, a charging device that charges the particles generated by the particle generating device, a holder that can hold a substrate, an inner surface is electrically insulating, and one of A particle discharge pipe for supplying the particles charged to the opening by the charging device together with a carrier gas and discharging the particles together with the carrier gas from the other opening toward the substrate, and the substrate of the particle discharge pipe Particle deposition, comprising: a conductive member provided on the outer periphery of the side end portion; and a control means for controlling the potential of the conductive member to be constant , wherein the conductive member has a bowl-shaped portion. A layer forming apparatus is provided.
[0007]
In the present invention, the control means may be configured so that the conductive member and the holder have the same potential. Alternatively, the control means may be configured to be able to switch the potential of the conductive member between a plurality of values.
[0008]
The conductive member may cover the end surface of the particle discharge tube on the substrate side. Alternatively, the distance between the substrate-side surface of the conductive member and the substrate may be shorter than the distance between the substrate-side end surface of the particle discharge tube and the substrate .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same referential mark is attached | subjected to the same or similar component, and the overlapping description is abbreviate | omitted.
[0010]
FIG. 1 is a diagram schematically showing a particle deposition layer forming apparatus according to a first embodiment of the present invention. The particle deposition layer forming apparatus 1 includes a particle generation device 2, a cooling device 3, a charging device 4, a particle transfer tube 5, a particle discharge tube 6, a conductive member 7, a holder 8, and a control unit 9.
[0011]
The particle generator 2 is not particularly limited as long as it can generate nanometer-scale particles. However, since the particles are discharged from the particle discharge pipe 6 together with the carrier gas, from the viewpoint of simplifying the configuration of the particle deposition layer forming apparatus 1, the particle generating apparatus 2 is formed by a vapor phase method such as a CVD (Chemical Vapor Deposition) method. Advantageously, it produces particles. Here, as an example, it is assumed that the particle generation device 2 generates particles by a gas phase method.
[0012]
The cooling device 3 includes a cooling jacket, for example, and cools the particles supplied to the charging device 4 together with a carrier gas such as nitrogen via the particle transfer pipe 5. The cooling device 3 may not be provided when the particle generating device 2 discharges sufficiently cooled particles or carrier gas.
[0013]
The charging device 4 charges the particles generated by the particle generating device 2 positively or negatively. As the charging device 4, for example, a device using corona discharge or the like can be used.
[0014]
The particle discharge tube 6 discharges particles positively or negatively charged by the charging device 4 together with the carrier gas. The inner surface of the particle discharge pipe 6 is electrically insulating.
[0015]
The conductive member 7 is provided so as to surround the particle discharge tube 6 from the outside. The conductive member 7 may cover the entire outer surface of the particle discharge tube 6, but may be provided on the outer periphery of the end portion on the holder 8 side of the particle discharge tube 6 as shown in FIG. 1. The conductive member 7 may be a conductive film provided on the outer surface of the particle discharge tube 6 or may be a tube that can be handled independently. In the latter case, the particle discharge pipe 6 may be an insulating film provided on the inner surface of the conductive member. The structure of the conductive member 7 will be described later in detail.
[0016]
The holder 8 detachably holds the substrate 10 so that the substrate 10 faces the discharge port of the particle discharge tube 6. The holding surface for holding the substrate 10 of the holder 8 can be made of, for example, a conductor.
[0017]
The control means 9 controls the potential of the conductive member 7 to be constant. Typically, the control means 9 maintains the potential of the conductive member 7 at a predetermined set value. The control means 9 may be capable of switching the potential of the conductive member 7 between a plurality of values, or may not be capable of such switching.
[0018]
The control means 9 may include a constant voltage device that can switch the voltage to be maintained between a plurality of values, or may include a constant voltage device that cannot be switched. Further, the potential of the conductive member 7 may be made equal to the ground potential by the control means 9. That is, the control means 9 may include a member constituting a conductive path that connects the conductive member 7 and the ground. The holding surface of the holder 8 may be grounded and maintained at the ground potential, or may be connected to the control means 9 and maintained at a desired potential.
[0019]
FIG. 2 is a cross-sectional view schematically showing an example of a structure that can be employed in the particle deposition layer forming apparatus 1 of FIG. The conductive member 7 shown in FIG. 2 is provided on the outer periphery of the end portion of the particle discharge tube 6 on the substrate 10 side, and the end surface of the conductive member 7 facing the substrate 10 side and the end surface of the particle discharge tube 6 are on the same plane. It is in. In FIG. 2, as an example, the conductive member 7 is grounded. Here, as an example, it is assumed that the particles 11 discharged from the particle discharge tube 6 are negatively charged, and a positive charge distribution is formed in a predetermined pattern on the surface of the substrate 10.
[0020]
According to such a configuration, particles can be adsorbed with high selectivity to the charged portion of the surface of the substrate 10. This will be described while comparing FIG. 2 with FIGS. 3 (a) and 3 (b).
[0021]
3A and 3B are cross-sectional views schematically showing the structure of a particle discharge pipe employed in the particle deposition layer forming apparatus according to the comparative example.
[0022]
In the structure shown in FIG. 3A, the particle discharge tube 6 is made of a conductor. In the structure shown in FIG. 3A, the particle discharge pipe 6 is grounded for safety. According to the structure shown in FIG. 3A, when the particle 11 negatively charged by the charging device 4 collides with the inner wall while passing through the particle discharge tube 6, electrons are taken away by the particle discharge tube 6. Therefore, the electrostatic attractive force between the particle 11 and the charging part formed on the surface of the substrate 10 is weakened. As a result, the particles 11 cannot be adsorbed only on the charged part, and the particles 11 are adsorbed also on the non-charged part.
[0023]
In the structure shown in FIG. 3B, the particle discharge pipe 6 is formed of an insulator. According to the structure shown in FIG. 3B, when the particle 11 negatively charged by the charging device 4 collides with the inner wall while passing through the particle discharge tube 6, the particle 11 takes electrons into the particle discharge tube 6. As a result, the inner wall of the particle discharge pipe 6 is negatively charged. When the inner wall of the particle discharge tube 6 is sufficiently charged, the electrostatic repulsion between the inner wall of the particle discharge tube 6 and the negatively charged particle 11 prevents the particles 11 from colliding with the particle discharge tube 6. The Therefore, according to the structure shown in FIG. 3B, it is possible to suppress the charge of the particles 11 from being taken away by the particle discharge pipe 6. However, in the structure shown in FIG. 3B, a strong electric field 12 is generated between the negatively charged particle discharge tube 6 and the charging portion formed on the surface of the substrate 10. Therefore, even in the structure shown in FIG. 3B, the particles 11 cannot be adsorbed only on the charged portion, and the particles 11 are also adsorbed on the non-charged portion.
[0024]
In contrast, the structure shown in FIG. 2 uses an electrically insulating particle discharge pipe 6. Therefore, it is possible to suppress the charge of the particles 11 from being taken away by the particle discharge pipe 6. In addition, in the structure shown in FIG. 2, the conductive member 7 is provided on the outer periphery of the end portion of the particle discharge tube 6 on the substrate 10 side, and the conductive member 7 is grounded. Therefore, although a strong electric field 12 is generated between the particle discharge tube 6 and the conductive member 7, a strong electric field is not generated between the particle discharge tube 6 and the charging portion formed on the surface of the substrate 10. Therefore, according to the structure shown in FIG. 2, the particles 11 can be adsorbed only on the charging portion. That is, according to the structure shown in FIG. 2, the particles 11 can be adsorbed with high selectivity to the charged portion of the substrate 10.
[0025]
In the present embodiment, the structure of the conductive member 7 can be variously modified.
4A to 4D are cross-sectional views schematically showing another example of a structure that can be adopted for the conductive member 7 in the particle deposition layer forming apparatus 1 of FIG.
[0026]
In the structure shown in FIG. 4A, the conductive member 7 covers the end surface of the particle discharge tube 6 on the substrate 10 side. According to this structure, compared with the structure shown in FIG. 2, the effect of suppressing the generation of a strong electric field between the particle discharge tube 6 and the charged portion on the surface of the substrate 10 is great. Therefore, when this structure is adopted, the particles 11 can be adsorbed with higher selectivity to the charged portion of the substrate 10.
[0027]
In the structure shown in FIG. 4B, the distance between the substrate 10 side surface of the conductive member 7 and the substrate 10 is larger than the distance between the substrate 10 side end surface of the particle discharge tube 6 and the substrate 10. short. Compared with the structure shown in FIG. 2, this structure also has a great effect of suppressing the generation of a strong electric field between the particle discharge tube 6 and the charged portion on the surface of the substrate 10. Therefore, when this structure is adopted, the particles 11 can be adsorbed with higher selectivity to the charged portion of the substrate 10.
[0028]
In the structure shown in FIG. 4C, the conductive member 7 includes a bowl-shaped portion surrounding the substrate 10 side end portion of the particle discharge tube 6. Compared with the structure shown in FIG. 2, this structure also has a great effect of suppressing the generation of a strong electric field between the particle discharge tube 6 and the charged portion on the surface of the substrate 10. Therefore, when this structure is adopted, the particles 11 can be adsorbed with higher selectivity to the charged portion of the substrate 10.
[0029]
In the structure shown in FIG. 4D, the conductive member 7 has a hook-like portion in the vicinity of the end of the particle discharge tube 6 on the substrate 10 side. In addition, in the structure shown in FIG. 4D, the conductive member 7 covers the end surface of the particle discharge tube 6 on the substrate 10 side. Compared with the structure shown in FIG. 2, this structure also has a great effect of suppressing the generation of a strong electric field between the particle discharge tube 6 and the charged portion on the surface of the substrate 10. Therefore, when this structure is adopted, the particles 11 can be adsorbed with higher selectivity to the charged portion of the substrate 10.
[0030]
FIG. 5A is a diagram showing an example of an equipotential surface when the structure shown in FIG. 4D is adopted for the conductive member 7 of the particle deposition layer forming apparatus 1 shown in FIG. FIG. 5B is a diagram showing an example of an equipotential surface when the structure shown in FIG. Note that the data shown in FIG. 5A is obtained assuming that the conductive member 7 is grounded. The data shown in FIG. 5B is obtained when the potential of the particle discharge tube 6 is maintained at -2 kV.
[0031]
As shown in FIGS. 5 (a) and 5 (b), when the structure shown in FIG. 4 (d) is adopted for the conductive member 7, the particle discharge pipe is compared with the case where the structure shown in FIG. 3 (a) is adopted. The electric field between 6 and the substrate 10 is weak. In this example, when the structure shown in FIG. 4D is used for the conductive member 7, the electric field between the particle discharge tube 6 and the substrate 10 is smaller than when the structure shown in FIG. It is suppressed to about 1/10.
[0032]
As described above, according to the present embodiment, a strong electric field is not generated between the particle discharge tube 6 and the charging portion formed on the surface of the substrate 10, so that the selectivity to the charging portion of the substrate 10 is high. The particles 11 can be adsorbed.
[0033]
In the present embodiment, the speed of the particles 11 ejected from the particle ejection pipe 6 can be controlled by appropriately setting the potential of the conductive member 7. For example, if the potential of the conductive member 7 is set so that the polarity of the conductive member 7 is opposite to the charged polarity of the particles 11, an electrostatic attractive force may be generated between the conductive member 7 and the particles 11. it can. Therefore, the speed of the particles 11 can be reduced.
[0034]
In the present embodiment, a classification device may be provided between the particle generation device 2 and the particle discharge pipe 6. Thereby, the particles 11 having a desired particle diameter can be adsorbed on the substrate 10.
[0035]
Next, a second embodiment of the present invention will be described.
FIG. 6 is a diagram schematically showing a particle deposition layer forming apparatus according to the second embodiment of the present invention. In the present embodiment, a charging device 4 that charges some particles 11 positively and charges other particles 11 negatively, for example, a device that ionizes a gas by α rays emitted from a radioactive substance such as americium. In addition, the second embodiment is the same as the first embodiment except that a classification device 15 for classifying the particles 11 according to the charging polarity is provided. Even when such a configuration is adopted, the same effect as described in the first embodiment can be obtained.
[0036]
【The invention's effect】
As described above, according to the present invention, there is provided a particle deposition layer forming apparatus capable of adsorbing particles with high selectivity with respect to a charged portion of a substrate surface.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a particle deposition layer forming apparatus according to a first embodiment of the present invention.
2 is a cross-sectional view schematically showing an example of a structure that can be employed in the particle deposition layer forming apparatus of FIG.
FIGS. 3A and 3B are cross-sectional views schematically showing the structure of a particle discharge pipe employed in a particle deposition layer forming apparatus according to a comparative example. FIGS.
4A to 4D are cross-sectional views schematically showing another example of a structure that can be adopted as a conductive member in the particle deposition layer forming apparatus of FIG.
5A is a view showing an example of an equipotential surface when the structure shown in FIG. 4D is adopted for the conductive member of the particle deposition layer forming apparatus shown in FIG. 1, and FIG. The figure which shows an example of an equipotential surface at the time of employ | adopting the structure shown to (a).
FIG. 6 is a diagram schematically showing a particle deposition layer forming apparatus according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Particle deposition layer formation apparatus, 2 ... Particle production | generation apparatus, 3 ... Cooling apparatus, 4 ... Charging apparatus, 5 ... Particle transfer pipe, 6 ... Particle discharge pipe, 7 ... Conductive member, 8 ... Holder, 9 ... Control means DESCRIPTION OF SYMBOLS 10 ... Substrate, 11 ... Particle, 12 ... Electric field, 15 ... Classification apparatus.

Claims (4)

粒子を生成する粒子生成装置と、
前記粒子生成装置で生成した前記粒子を帯電させる帯電装置と、
基板を保持可能なホルダと、
内面が電気的に絶縁性であり且つ一方の開口に前記帯電装置により帯電させられた前記粒子がキャリアガスとともに供給されるとともに他方の開口から前記基板に向けて前記粒子を前記キャリアガスとともに吐出する粒子吐出管と、
前記粒子吐出管の前記基板側端部外周に設けられた導電性部材と、
前記導電性部材の電位を一定に制御する制御手段とを具備し、前記導電性部材は鍔状部を備えていることを特徴とする粒子堆積層形成装置。
A particle generator for generating particles;
A charging device for charging the particles generated by the particle generating device;
A holder capable of holding a substrate;
The inner surface is electrically insulating and the particles charged by the charging device in one opening are supplied together with a carrier gas, and the particles are discharged together with the carrier gas from the other opening toward the substrate. A particle discharge tube;
A conductive member provided on the outer periphery of the substrate side end of the particle discharge tube;
And a control means for controlling the potential of the conductive member to be constant , wherein the conductive member includes a bowl-shaped portion .
前記制御手段は前記導電性部材と前記ホルダとを同電位とするか或いは前記導電性部材の電位を複数の値の間で切り替え可能に構成されたことを特徴とする請求項1に記載の粒子堆積層形成装置。  2. The particle according to claim 1, wherein the control unit is configured to make the conductive member and the holder have the same potential, or to switch the potential of the conductive member between a plurality of values. Deposited layer forming device. 前記導電性部材は前記粒子吐出管の前記基板側の端面を覆っていることを特徴とする請求項1または請求項2に記載の粒子堆積層形成装置。  3. The particle deposition layer forming apparatus according to claim 1, wherein the conductive member covers an end surface of the particle discharge tube on the substrate side. 前記導電性部材の前記基板側の面と前記基板との間の距離は、前記粒子吐出管の前記基板側の端面と前記基板との間の距離よりも短いことを特徴とする請求項1または請求項2に記載の粒子堆積層形成装置。  The distance between the substrate-side surface of the conductive member and the substrate is shorter than the distance between the substrate-side end surface of the particle discharge tube and the substrate. The particle deposited layer forming apparatus according to claim 2.
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