JP2004296203A - Counter electrode for dye sensitized solar cell, and dye sensitized solar cell - Google Patents

Counter electrode for dye sensitized solar cell, and dye sensitized solar cell Download PDF

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JP2004296203A
JP2004296203A JP2003085560A JP2003085560A JP2004296203A JP 2004296203 A JP2004296203 A JP 2004296203A JP 2003085560 A JP2003085560 A JP 2003085560A JP 2003085560 A JP2003085560 A JP 2003085560A JP 2004296203 A JP2004296203 A JP 2004296203A
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dye
counter electrode
solar cell
electrode
sensitized solar
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JP4465971B2 (en
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Shingo Ono
信吾 大野
Hideo Sugiyama
秀夫 杉山
Masahito Yoshikawa
雅人 吉川
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Bridgestone Corp
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Bridgestone Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/542—Dye sensitized solar cells

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a counter electrode for dye sensitized solar cell which does not have a problem of deformation in the case of being arranged opposed to a semiconductor electrode of the dye sensitized solar cell, and can maintain a spacing with the semiconductor electrode constant, and is superior in assembling work performance of the dye sensitized solar cell. <P>SOLUTION: A dot spacer 14 for preventing contact with the semiconductor electrode is formed on the face opposed to the semiconductor electrode, and using the counter electrode 10, the dye sensitized solar cell is formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は色素増感型太陽電池用対向電極及び色素増感型太陽電池に係り、特に色素増感型太陽電池において、電解質を介して色素増感型半導体電極と対面配置される対向電極と、このような対向電極を備える色素増感型太陽電池に関する。
【０００２】
【従来の技術】
増感色素を吸着させた酸化物半導体を電極に用いて太陽電池を構成することは既に知られている。図２は、このような色素増感型太陽電池の一般的な構造を示す断面図である。図２に示す如く、ガラス基板等の基板１上に透明電極２が設けられ、この透明電極２上に分光増感色素を吸着させた金属酸化物半導体膜３が形成されている。この色素増感型半導体電極４と対向して間隔をあけて対向電極５が配置されており、図示しない封止材により色素増感型半導体電極４と対向電極５との間に電解質６が封入されている。７は、半導体電極４と対向電極５との間隔を維持するために周縁部に設けられた絶縁性のスペーサである。
【０００３】
色素吸着半導体膜３は、通常、色素を吸着させた酸化チタン薄膜よりなり、この酸化チタン薄膜に吸着されている色素が可視光によって励起され、発生した電子を酸化チタン微粒子に渡すことによって発電が行われる。対向電極４は、ガラス又はプラスチック等の基板上にＩＴＯ（インジウムスズ酸化物）やＦＴＯ（フッ素ドープ酸化スズ）等の透明導電膜が形成され、この透明導電膜上に、透明導電膜と増感色素との間の電子の授受を促進させるための触媒としての白金膜又は炭素膜が、透過率を低下させない程度の膜厚に形成されたものである。また、電解質６としては、酸化還元性物質、例えば、ＬｉＩ、ＮａＩ、ＫＩ、ＣａＩ２などの金属ヨウ化物とヨウ素の組み合わせ、ＬｉＢｒ、ＮａＢｒ、ＫＢｒ、ＣａＢｒ２などの金属臭化物と臭素の組み合わせ、好ましくは、金属ヨウ化物とヨウ素の組み合わせよりなる酸化還元性物質を，プロピレンカーボネートなどのカーボネート化合物、アセトニトリルなどのニトリル化合物等の溶媒に溶解してなる電解液が用いられている。
【０００４】
【発明が解決しようとする課題】
このような色素増感型太陽電池を組み立てる際には、半導体電極４と対向電極５とを、周縁にスペーサ７を配置して対面させ、半導体電極４と対向電極５との間隙に電解液を注入して封止するが、この組み立てには煩雑な作業を要する。
【０００５】
また、半導体電極４と対向電極５との間に電解液を注入したユニットは、図３に示す如く、対向電極５のそり等の変形により、対向電極５と半導体電極４との間隔がばらつき、場合によっては、対向電極５と半導体電極４とが接触して短絡に到ることがある。この対向電極５の変形は、色素増感型太陽電池が大面積化した場合、スペーサ７による電極間隔の保持が困難となり、特に著しい。また、近年、色素増感型太陽電池の薄肉、軽量化等の要望から、対向電極５として基材フィルム上に導電膜を形成したものが適用されるようになってきているが、このようなフィルムタイプの対向電極にあっては、そり等の変形が起こり易く、しかもその変形量も大きいため、スペーサ７，７間の電極間隔を一定に保つことが難しい。このような電極間隔のばらつきは、色素増感型太陽電池の光電変換効率のばらつきにつながり、著しい場合には、短絡のために発電不良となる。
【０００６】
本発明は上記従来の問題点を解決し、色素増感型太陽電池の半導体電極に対面配置された場合の変形の問題がなく、半導体電極との間隔を一定に保つことができ、しかも色素増感型太陽電池の組み立て作業性にも優れた色素増感型太陽電池用対向電極と、この対向電極を用いたことにより、半導体電極と対向電極との間隔を一定に保ち、安定かつ良好な光電変換効率で発電することが可能な、組み立て作業性に優れた色素増感型太陽電池を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明の色素増感型太陽電池用対向電極は、色素増感型太陽電池において、電解質を介して色素増感型半導体電極と対面配置される対向電極であって、該半導体電極と対向する面の少なくとも非周縁部に、該半導体電極との接触防止用の、絶縁性材料よりなるスペーサが設けられていることを特徴とする。
【０００８】
本発明の対向電極は、半導体電極と対向する面の非周縁部にも、半導体電極との接触防止用の絶縁性材料よりなるスペーサが設けられているため、このスペーサにより対向電極の変形を防止し、対向電極と半導体電極との間隔を一定に保つことが可能である。
【０００９】
また、このスペーサの高さを制御することにより、電極間距離の微調整も可能となり、これにより光電変換効率の向上を図ることもできる。
【００１０】
しかも、対向電極にスペーサが設けられていることから、別途スペーサを用いることなく太陽電池の組み立てを行うこともでき、組み立てに必要な部品点数が減ることにより、太陽電池を容易に組み立てることができるようになる。
【００１１】
本発明において、このスペーサはドット状のスペーサ（以下「ドットスペーサ」と称す。）であることが好ましく、また、このスペーサは透明絶縁性材料よりなることが好ましい。
【００１２】
本発明の対向電極は、特に基材フィルムを用いたフィルムタイプの対向電極に好適である。
【００１３】
本発明の色素増感型太陽電池は、色素増感型半導体電極と、この色素増感型半導体電極に対面して設けられた対向電極と、該色素増感型半導体電極と対向電極との間に配置された電解質とを有する色素増感型太陽電池において、該対向電極として、このような本発明の対向電極を用いたものであり、電極間隔を一定に保つことにより、安定かつ良好な光電変換効率で発電することができると共に、別途スペーサを用いることなく、良好な作業性のもとに容易に組み立てることができる。
【００１４】
なお、電極間隔を一定に保つことにより、安定かつ良好な光電変換効率で発電することができるという効果は、色素増感型半導体電極と、この色素増感型半導体電極に対面して設けられた対向電極と、該色素増感型半導体電極と対向電極との間に配置された電解質とを有する色素増感型太陽電池において、該半導体電極と対向電極との間の少なくとも非周縁部に絶縁性材料よりなるスペーサを設けた請求項７の色素増感型太陽電池によっても達成される。
【００１５】
【発明の実施の形態】
以下に図面を参照して本発明の色素増感型太陽電池用対向電極及び色素増感型太陽電池の実施の形態を詳細に説明する。
【００１６】
図１は、本発明の色素増感型太陽電池用対向電極の実施の形態を示す断面図である。
【００１７】
図１の色素増感型太陽電池用対向電極１０は、基材フィルム１１の上に透明導電膜１２が形成され、この透明導電膜１２上に白金（Ｐｔ）薄膜１３が形成され、更に、このＰｔ薄膜１３上に絶縁性ドットスペーサ１４が形成されたものである。
【００１８】
基材フィルム１１としては、ＰＥＴ、ＰＥＮ、ＰＣ、アクリル、その他、透明樹脂フィルムや、ＰＩ、ＰＳＳ等のエンプラ系フィルム等の厚さ１２μｍ〜２ｍｍ程度のものが用いられる。
【００１９】
また、この基材フィルム１１上に形成する透明導電膜１２は、ＩＴＯ、ＦＴＯ、ＡＴＯ等の透明導電膜であって、その膜厚は、通常１００〜１０００ｎｍ程度である。
【００２０】
この透明導電膜１２上に形成されるＰｔ薄膜１３は、透明性を損なうことがないように、通常０．２〜１０ｎｍ程度の厚さに形成される。なお、このＰｔ薄膜の代りに炭素膜を形成しても良い。
【００２１】
絶縁性ドットスペーサ１４は、透明絶縁性材料より形成されることが好ましく、このような透明絶縁性ドットスペーサ１４を形成する透明絶縁性材料としては、アクリル樹脂、ポリエステル、ポリウレタン等の樹脂や、接着材や粘着材に用いられる材料、印刷用の透明インキ等の１種又は２種以上が挙げられる。
【００２２】
絶縁性ドットスペーサ１４は、色素増感型太陽電池において、半導体電極と対向電極との間に確保すべき電極間隔と同程度の高さに形成される。
【００２３】
個々の絶縁性ドットスペーサ１４の形状には特に制限はなく、図１に示すような円錐台形状の他、角錐台形状、円柱形状、角柱形状であっても良い。
【００２４】
絶縁性ドットスペーサ１４の形成割合が少な過ぎるとドットスペーサ１４を形成したことによる対向電極の変形防止、電極間隔の維持効果を十分に得ることができず、多過ぎると対向電極１０の有効電極面積が減少し、光電変換効率を低下させる原因となる。従って、絶縁性ドットスペーサの形成割合は、対向電極１０に用いた基材フィルム１１の種類による変形のし易さや、対向電極１０の面積による変形のし易さ等によっても異なるが、対向電極１０の電極面積に対するドットスペーサ１４の底面積（電極面への投影面積）の合計の割合が１％以下となるように形成することが好ましい。
【００２５】
なお、個々のドットスペーサ１４の高さは、必ずしも同一である必要はなく、部分的に異なる高さのドットスペーサ１４を形成することも可能である。また、個々のドットスペーサ１４の形状や大きさ（電極面への投影面積）も必ずしも同一である必要はなく、部分的に異なっていても良い。
【００２６】
前述の透明絶縁性材料を用いて、このようなドットスペーサ１４を形成する方法としては、例えば透明導電膜１２及びＰｔ薄膜１３を形成した基材フィルム１１に対して、スクリーン印刷法で形成する方法が挙げられる。
【００２７】
なお、本発明において、対向電極１０に形成するスペーサは、対向電極の導電性面積を大きく低減することなく、半導体電極との接触を防止し得るようなものであれば良く、図１に示すようなドットスペーサの他、線状（直線状又は曲線状）、或いは、格子状、或いは、これらを組み合わせたスペーサであっても良い。この場合においても、スペーサの形成割合（面積割合）は、前述の範囲とすることが好ましい。
【００２８】
なお、本発明の対向電極は、その電極面の全面にわたって、ドットスペーサ１４等のスペーサを設けても良く、電極面の非周縁部のみ設けても良い。即ち、ドットスペーサ１４等のスペーサを電極面の非周縁部のみに設け、周縁部には、図２に示すような従来のスペーサ７を設けても良い。
【００２９】
周縁部に従来と同様のスペーサを設ける場合、非周縁部に設けるスペーサは必ずしも保持すべき電極間隔と同等の高さである必要はなく、その高さよりも若干低くしても、電極同士の接触は十分に防止することができる。また、本発明に係るスペーサを対向電極の電極面に全面的に設ける場合には、周縁部に設ける従来の別部品のスペーサが不要となり、太陽電池の組み立てが容易となる。
【００３０】
本発明の色素増感型太陽電池は、このような本発明の対向電極を用いて常法に従って容易に組み立てられる。この際、上述の如く、別部品としてのスペーサを不要とすることもでき、組み立て作業性に優れる。
【００３１】
なお、本発明は、特に変形し易い基材フィルムを用いたフィルムタイプの対向電極に好適であるが、何らこれに限定されずガラス基板を用いた対向電極にも適用することができる。
【００３２】
【発明の効果】
以上詳述した通り、本発明によれば、色素増感型太陽電池の対向電極の変形を防止して、半導体電極と対向電極との間隔を一定に保つことにより、色素増感型太陽電池の光電変換効率を安定かつ良好なものとすると共に、色素増感型太陽電池の組み立てを容易に行うことが可能となる。
【図面の簡単な説明】
【図１】本発明の色素増感型太陽電池用対向電極の実施の形態を示す断面図である。
【図２】色素増感型太陽電池の一般的な構造を示す断面図である。
【図３】従来の問題点を示す断面図である。
【符号の説明】
１ 基板
２ 透明電極
３ 色素吸着半導体膜
４ 色素増感型半導体電極
５ 対向電極
６ 電解質
７ スペーサ
１０ 色素増感型太陽電池用対向電極
１１ 基材フィルム
１２ 透明導電膜
１３ Ｐｔ薄膜
１４ 絶縁性ドットスペーサ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a counter electrode for a dye-sensitized solar cell and a dye-sensitized solar cell, particularly, in a dye-sensitized solar cell, a counter electrode disposed to face the dye-sensitized semiconductor electrode via an electrolyte, It relates to a dye-sensitized solar cell provided with such a counter electrode.
[0002]
[Prior art]
It is already known to form a solar cell using an oxide semiconductor to which a sensitizing dye is adsorbed as an electrode. FIG. 2 is a cross-sectional view showing a general structure of such a dye-sensitized solar cell. As shown in FIG. 2, a transparent electrode 2 is provided on a substrate 1 such as a glass substrate, and a metal oxide semiconductor film 3 having a spectral sensitizing dye adsorbed thereon is formed on the transparent electrode 2. A counter electrode 5 is arranged facing the dye-sensitized semiconductor electrode 4 at an interval, and an electrolyte 6 is sealed between the dye-sensitized semiconductor electrode 4 and the counter electrode 5 by a sealing material (not shown). Have been. Reference numeral 7 denotes an insulating spacer provided on a peripheral portion to maintain an interval between the semiconductor electrode 4 and the counter electrode 5.
[0003]
The dye-adsorbing semiconductor film 3 is usually made of a titanium oxide thin film on which a dye is adsorbed, and the dye adsorbed on the titanium oxide thin film is excited by visible light, and the generated electrons are passed to the titanium oxide fine particles to generate power. Done. The counter electrode 4 is formed by forming a transparent conductive film such as ITO (indium tin oxide) or FTO (fluorine-doped tin oxide) on a substrate such as glass or plastic, and sensitizing the transparent conductive film on the transparent conductive film. A platinum film or a carbon film as a catalyst for promoting the transfer of electrons to and from the dye is formed to a thickness that does not decrease the transmittance. Further, as the electrolyte 6, a redox substance, for example, a combination of a metal iodide such as LiI, NaI, KI, and CaI 2 with iodine, a combination of a metal bromide such as LiBr, NaBr, KBr, and CaBr 2 with bromine, preferably An electrolytic solution obtained by dissolving a redox substance composed of a combination of metal iodide and iodine in a solvent such as a carbonate compound such as propylene carbonate or a nitrile compound such as acetonitrile is used.
[0004]
[Problems to be solved by the invention]
When assembling such a dye-sensitized solar cell, the semiconductor electrode 4 and the counter electrode 5 are opposed to each other by disposing a spacer 7 on the peripheral edge, and an electrolytic solution is filled in a gap between the semiconductor electrode 4 and the counter electrode 5. It is injected and sealed, but this assembly requires a complicated operation.
[0005]
As shown in FIG. 3, the unit in which the electrolytic solution is injected between the semiconductor electrode 4 and the counter electrode 5 has a gap between the counter electrode 5 and the semiconductor electrode 4 due to deformation of the counter electrode 5 such as warpage. In some cases, the counter electrode 5 and the semiconductor electrode 4 may come into contact with each other and cause a short circuit. This deformation of the counter electrode 5 is particularly remarkable when the dye-sensitized solar cell has a large area, because it is difficult to maintain the electrode interval by the spacer 7. In recent years, in view of the demand for thinner and lighter dye-sensitized solar cells, a counter electrode 5 having a conductive film formed on a substrate film has been applied. In the case of a film-type counter electrode, deformation such as warpage tends to occur, and the amount of the deformation is large. Therefore, it is difficult to keep the electrode interval between the spacers 7 constant. Such a variation in the electrode interval leads to a variation in the photoelectric conversion efficiency of the dye-sensitized solar cell. In a remarkable case, power generation failure occurs due to a short circuit.
[0006]
The present invention solves the above-mentioned conventional problems, does not have a problem of deformation when the semiconductor electrode of the dye-sensitized solar cell is disposed facing the semiconductor electrode, can maintain a constant distance from the semiconductor electrode, and can further increase the dye sensitization. By using a counter electrode for a dye-sensitized solar cell that has excellent workability in assembling a photo-sensitive solar cell and using this counter electrode, the distance between the semiconductor electrode and the counter electrode is kept constant, and a stable and good photoelectric It is an object of the present invention to provide a dye-sensitized solar cell capable of generating power at a conversion efficiency and having excellent assembling workability.
[0007]
[Means for Solving the Problems]
The counter electrode for a dye-sensitized solar cell of the present invention is a counter electrode that is disposed to face a dye-sensitized semiconductor electrode via an electrolyte in a dye-sensitized solar cell, and the surface facing the semiconductor electrode. A spacer made of an insulating material for preventing contact with the semiconductor electrode is provided at least on a non-peripheral portion of the semiconductor device.
[0008]
In the counter electrode of the present invention, since a spacer made of an insulating material for preventing contact with the semiconductor electrode is provided also on the non-peripheral portion of the surface facing the semiconductor electrode, the spacer prevents deformation of the counter electrode. However, the distance between the counter electrode and the semiconductor electrode can be kept constant.
[0009]
In addition, by controlling the height of the spacer, fine adjustment of the distance between the electrodes is possible, whereby the photoelectric conversion efficiency can be improved.
[0010]
Moreover, since the spacer is provided on the counter electrode, the solar cell can be assembled without using a separate spacer, and the solar cell can be easily assembled by reducing the number of components required for the assembly. Become like
[0011]
In the present invention, this spacer is preferably a dot-shaped spacer (hereinafter, referred to as “dot spacer”), and the spacer is preferably made of a transparent insulating material.
[0012]
The counter electrode of the present invention is particularly suitable for a film-type counter electrode using a base film.
[0013]
The dye-sensitized solar cell of the present invention includes a dye-sensitized semiconductor electrode, a counter electrode provided to face the dye-sensitized semiconductor electrode, and a gap between the dye-sensitized semiconductor electrode and the counter electrode. In the dye-sensitized solar cell having the electrolyte disposed in the above, the counter electrode of the present invention is used as the counter electrode, and a stable and good photoelectric It is possible to generate power with conversion efficiency and to easily assemble with good workability without using a separate spacer.
[0014]
The effect that power can be generated stably and with good photoelectric conversion efficiency by keeping the electrode interval constant is provided in the dye-sensitized semiconductor electrode and the dye-sensitized semiconductor electrode. In a dye-sensitized solar cell having a counter electrode and an electrolyte disposed between the dye-sensitized semiconductor electrode and the counter electrode, at least a non-peripheral portion between the semiconductor electrode and the counter electrode has an insulating property. This is also achieved by the dye-sensitized solar cell according to claim 7, wherein a spacer made of a material is provided.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a counter electrode for a dye-sensitized solar cell and a dye-sensitized solar cell of the present invention will be described in detail with reference to the drawings.
[0016]
FIG. 1 is a sectional view showing an embodiment of a counter electrode for a dye-sensitized solar cell of the present invention.
[0017]
In the counter electrode 10 for a dye-sensitized solar cell in FIG. 1, a transparent conductive film 12 is formed on a base film 11, and a platinum (Pt) thin film 13 is formed on the transparent conductive film 12. An insulating dot spacer 14 is formed on a Pt thin film 13.
[0018]
As the base film 11, PET, PEN, PC, acrylic, or a transparent resin film or an engineering plastic film such as PI or PSS having a thickness of about 12 μm to 2 mm is used.
[0019]
The transparent conductive film 12 formed on the base film 11 is a transparent conductive film such as ITO, FTO, or ATO, and its thickness is usually about 100 to 1000 nm.
[0020]
The Pt thin film 13 formed on the transparent conductive film 12 is usually formed to a thickness of about 0.2 to 10 nm so as not to impair the transparency. Note that a carbon film may be formed instead of the Pt thin film.
[0021]
The insulating dot spacer 14 is preferably formed of a transparent insulating material. Examples of the transparent insulating material forming the transparent insulating dot spacer 14 include resins such as acrylic resin, polyester, and polyurethane, and adhesive. One or two or more of materials used for materials and adhesives, transparent inks for printing, and the like may be used.
[0022]
The insulating dot spacer 14 is formed at a height substantially equal to the electrode interval to be secured between the semiconductor electrode and the counter electrode in the dye-sensitized solar cell.
[0023]
The shape of each insulating dot spacer 14 is not particularly limited, and may be a truncated pyramid, a cylinder, or a prism in addition to the truncated cone as shown in FIG.
[0024]
If the formation ratio of the insulating dot spacers 14 is too small, deformation of the counter electrode due to the formation of the dot spacers 14 and the effect of maintaining the electrode interval cannot be sufficiently obtained, and if it is too large, the effective electrode area of the counter electrode 10. Is reduced, which causes a decrease in photoelectric conversion efficiency. Therefore, the formation ratio of the insulating dot spacers differs depending on the ease of deformation depending on the type of the base film 11 used for the counter electrode 10 and the ease of deformation depending on the area of the counter electrode 10. It is preferable that the ratio of the total area of the bottom area (projected area to the electrode surface) of the dot spacer 14 to the electrode area is 1% or less.
[0025]
Note that the heights of the individual dot spacers 14 do not necessarily have to be the same, and it is also possible to form the dot spacers 14 having partially different heights. Also, the shape and size (projected area on the electrode surface) of each dot spacer 14 need not always be the same, and may be partially different.
[0026]
As a method of forming such dot spacers 14 using the above-described transparent insulating material, for example, a method of forming the base film 11 on which the transparent conductive film 12 and the Pt thin film 13 are formed by screen printing. Is mentioned.
[0027]
In the present invention, the spacer formed on the counter electrode 10 may be any spacer that can prevent contact with the semiconductor electrode without significantly reducing the conductive area of the counter electrode, as shown in FIG. In addition to a simple dot spacer, a linear (straight or curved), grid, or a combination of these may be used. Also in this case, it is preferable that the formation ratio (area ratio) of the spacer be in the above-described range.
[0028]
In the counter electrode of the present invention, a spacer such as the dot spacer 14 may be provided over the entire surface of the electrode, or only the non-peripheral portion of the electrode surface may be provided. That is, a spacer such as the dot spacer 14 may be provided only on the non-peripheral portion of the electrode surface, and the conventional spacer 7 as shown in FIG. 2 may be provided on the peripheral portion.
[0029]
When a spacer similar to the conventional one is provided on the peripheral portion, the spacer provided on the non-peripheral portion does not necessarily need to have the same height as the electrode interval to be held. Can be sufficiently prevented. Further, when the spacer according to the present invention is provided entirely on the electrode surface of the counter electrode, the conventional spacer as a separate component provided on the peripheral portion becomes unnecessary, and the solar cell can be easily assembled.
[0030]
The dye-sensitized solar cell of the present invention is easily assembled according to a conventional method using such a counter electrode of the present invention. At this time, as described above, a spacer as a separate component can be made unnecessary, and the assembling workability is excellent.
[0031]
The present invention is particularly suitable for a film-type counter electrode using a base film that is easily deformed, but is not limited to this and can be applied to a counter electrode using a glass substrate.
[0032]
【The invention's effect】
As described above in detail, according to the present invention, the deformation of the counter electrode of the dye-sensitized solar cell is prevented, and the distance between the semiconductor electrode and the counter electrode is kept constant. The photoelectric conversion efficiency can be made stable and good, and the dye-sensitized solar cell can be easily assembled.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a counter electrode for a dye-sensitized solar cell of the present invention.
FIG. 2 is a cross-sectional view illustrating a general structure of a dye-sensitized solar cell.
FIG. 3 is a cross-sectional view showing a conventional problem.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Substrate 2 Transparent electrode 3 Dye-adsorbing semiconductor film 4 Dye-sensitized semiconductor electrode 5 Counter electrode 6 Electrolyte 7 Spacer 10 Counter electrode for dye-sensitized solar cell 11 Base film 12 Transparent conductive film 13 Pt thin film 14 Insulating dot spacer

Claims (7)

色素増感型太陽電池において、電解質を介して色素増感型半導体電極と対面配置される対向電極であって、
該半導体電極と対向する面の少なくとも非周縁部に、該半導体電極との接触防止用の、絶縁性材料よりなるスペーサが設けられていることを特徴とする色素増感型太陽電池用対向電極。In a dye-sensitized solar cell, a counter electrode disposed to face the dye-sensitized semiconductor electrode via an electrolyte,
A counter electrode for a dye-sensitized solar cell, wherein a spacer made of an insulating material for preventing contact with the semiconductor electrode is provided at least on a non-peripheral portion of a surface facing the semiconductor electrode. 請求項１において、該スペーサがドット状であることを特徴とする色素増感型太陽電池用対向電極。The counter electrode for a dye-sensitized solar cell according to claim 1, wherein the spacer is in a dot shape. 請求項１又は２において、基材フィルムと、該基材フィルム上に設けられた導電膜と、該導電膜上に設けられた前記スペーサとを備えることを特徴とする色素増感型太陽電池用対向電極。The dye-sensitized solar cell according to claim 1 or 2, further comprising a base film, a conductive film provided on the base film, and the spacer provided on the conductive film. Counter electrode. 請求項３において、透明基材フィルムと、該透明基材フィルム上に設けられた透明導電膜と、該透明導電膜上に設けられた前記スペーサとを備えることを特徴とする色素増感型太陽電池用対向電極。The dye-sensitized solar cell according to claim 3, comprising: a transparent substrate film, a transparent conductive film provided on the transparent substrate film, and the spacer provided on the transparent conductive film. Counter electrode for battery. 請求項１ないし４のいずれか１項において、該スペーサが透明絶縁性材料よりなることを特徴とする色素増感型太陽電池用対向電極。The counter electrode for a dye-sensitized solar cell according to any one of claims 1 to 4, wherein the spacer is made of a transparent insulating material. 色素増感型半導体電極と、この色素増感型半導体電極に対面して設けられた対向電極と、該色素増感型半導体電極と対向電極との間に配置された電解質とを有する色素増感型太陽電池において、該対向電極が請求項１ないし５のいずれか１項に記載の対向電極であることを特徴とする色素増感型太陽電池。Dye-sensitization comprising a dye-sensitized semiconductor electrode, a counter electrode provided facing the dye-sensitized semiconductor electrode, and an electrolyte disposed between the dye-sensitized semiconductor electrode and the counter electrode. A dye-sensitized solar cell, wherein the counter electrode is the counter electrode according to any one of claims 1 to 5. 色素増感型半導体電極と、この色素増感型半導体電極に対面して設けられた対向電極と、該色素増感型半導体電極と対向電極との間に配置された電解質とを有する色素増感型太陽電池において、該半導体電極と対向電極との間の少なくとも非周縁部に絶縁性材料よりなるスペーサが設けられていることを特徴とする色素増感型太陽電池。Dye-sensitization comprising a dye-sensitized semiconductor electrode, a counter electrode provided facing the dye-sensitized semiconductor electrode, and an electrolyte disposed between the dye-sensitized semiconductor electrode and the counter electrode. A dye-sensitized solar cell, wherein a spacer made of an insulating material is provided at least at a non-peripheral portion between the semiconductor electrode and the counter electrode.
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