JPWO2011129322A1 - 光電変換装置、および光電変換装置の製造方法 - Google Patents
光電変換装置、および光電変換装置の製造方法 Download PDFInfo
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- JPWO2011129322A1 JPWO2011129322A1 JP2012510657A JP2012510657A JPWO2011129322A1 JP WO2011129322 A1 JPWO2011129322 A1 JP WO2011129322A1 JP 2012510657 A JP2012510657 A JP 2012510657A JP 2012510657 A JP2012510657 A JP 2012510657A JP WO2011129322 A1 JPWO2011129322 A1 JP WO2011129322A1
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Abstract
Description
光電変換装置21は、基板1と、該基板1の上に平面的に並べられた複数の光電変換セル10とを備えている。図1では、図示の都合上、2つの光電変換セル10の一部のみが示されている。但し、実際の光電変換装置21には、図面の左右方向に、多数の光電変換セル10が平面的に配列され得る。
図4から図9で示される各断面図は、図2で示された光電変換装置21の断面に対応する部分の製造途中の様子を示す。
ルイス塩基性有機化合物(第1ルイス塩基性有機化合物とも言う)と、I−B族元素を含む有機金属錯体(第1有機金属錯体とも言う)とが、有機溶媒(第1有機溶媒とも言う)に溶解されることで、第1錯体を含む溶液(第1錯体溶液とも言う)が調製される。このとき、攪拌が行われ、第1ルイス塩基性有機化合物と第1有機金属錯体との反応によって第1錯体が生成される。
金属アルコキシドと、カルコゲン元素含有有機化合物(第1カルコゲン元素含有有機化合物とも言う)とが、有機溶媒(第2有機溶媒とも言う)に溶解された後に、III−B族元素の原料が溶解されることで、第2錯体を含む溶液(第2錯体溶液とも言う)が調製される。このとき、攪拌が行われ、金属アルコキシドと第1カルコゲン元素含有有機化合物との反応によって第1カルコゲン元素含有有機化合物の金属塩(第2金属塩とも言う)が生成される。さらに、このとき、第2金属塩とIII−B族元素の原料との反応によって第2錯体が生成される。
上記の工程[A],[B]で調製された第1錯体溶液と第2錯体溶液との混合によって、第1錯体溶液と第2錯体溶液とが反応することで、前駆体(単一源前駆体とも言う)を含む沈殿物が生成される。この前駆体は、Cu等のI−B族元素と、InおよびGa等のIII−B族元素と、Se等のカルコゲン元素とを含有する。なお、第1錯体溶液と第2錯体溶液とを反応させる際の温度は0℃以上で且つ30℃以下であれば良く、反応時間は1時間以上で且つ5時間以内であれば良い。
上記の工程[C]で得られた単一源前駆体の沈殿物に有機溶媒(例えば、ピリジン等)が添加されることで、単一源前駆体の濃度が所定値(例えば、5〜50質量%)である溶液が生成される。この溶液に、III−B族元素とセレンとの化合物(例えば、Ga2Se3の粉末等)が、単一源前駆体の全量に対して、例えば1〜10質量%となるように添加されて、溶解されることで半導体形成用溶液が調製される。
次に、製造条件と接続層31bの発生との関係、ならびに接続層31bによる光電変換装置21の変換効率の向上について、具体例を示して説明する。
なお、本発明は上述の実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲において種々の変更、改良等が可能である。
2 下部電極層
3 光電変換層
4 上部電極層
5 グリッド電極
10 光電変換セル
21 光電変換装置
31 光吸収層
31a 主層
31b 接続層
32 バッファ層
45 接続部
Claims (5)
- 電極と、
前記電極の一主面の上に配され、I−III−VI族化合物半導体を含む半導体層と、を備え、
前記半導体層は、前記一主面側に位置するとともに、前記一主面に近ければ近いほどI−B族元素の物質量をIII−B族元素の物質量で除した値が増大する傾向を示す接続層、を有する光電変換装置。 - 前記一主面の法線方向における前記接続層の厚さが、前記法線方向における前記半導体層の厚さの10%以上で且つ50%以下である請求項1に記載の光電変換装置。
- 前記接続層が、前記一主面に近ければ近いほどI−VI族化合物が占める割合が高まる傾向を有する請求項1または請求項2に記載の光電変換装置。
- 前記I−VI族化合物が、銅とセレンとの化合物を含む請求項3に記載の光電変換装置。
- ルイス塩基性有機化合物とカルコゲン元素を含有する有機化合物とI−B族元素とIII−B族元素とを含有した溶液を用意する工程と、
前記溶液を電極の一主面の上に塗布してI−B族元素とIII−B族元素とを含む皮膜を形成する工程と、
100℃以上で且つ400℃以下の温度域で前記皮膜を加熱することで、前記一主面に近ければ近いほどI−B族元素の物質量をIII−B族元素の物質量で除した値が増大する傾向を示す接続層を前記一主面側に有し、且つI−III−VI族化合物半導体を含む半導体層を形成する工程と、を備える光電変換装置の製造方法。
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