JP5453758B2 - 有機光電変換素子、太陽電池及び光センサアレイ - Google Patents
有機光電変換素子、太陽電池及び光センサアレイ Download PDFInfo
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- JP5453758B2 JP5453758B2 JP2008262509A JP2008262509A JP5453758B2 JP 5453758 B2 JP5453758 B2 JP 5453758B2 JP 2008262509 A JP2008262509 A JP 2008262509A JP 2008262509 A JP2008262509 A JP 2008262509A JP 5453758 B2 JP5453758 B2 JP 5453758B2
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- photoelectric conversion
- organic photoelectric
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Description
3.前記一般式(1)〜(4)で表される低分子化合物が、p型半導体材料としてバルクヘテロジャンクション層に含まれることを特徴とする前記1又は2に記載の有機光電変換素子。
(一般式(1)〜(4)で表される低分子化合物)
先ず、一般式(1)〜(4)で表される低分子化合物について説明する。
上記一般式(1)〜(4)において、D 1 、D 2 、A 1 またはA 2 が複数存在するとき、芳香族環の環構造が同じであれば、複数の芳香族環は、それぞれ置換基を有していても有していなくても良い。
本発明の有機光電変換素子は、n型半導体材料及びp型半導体材料を混合したバルクヘテロジャンクション層に適用することが好ましく、p型半導体材料として本発明の低分子化合物を用いればよく、n型半導体材料としては特に限定されないが、例えば、フラーレン、オクタアザポルフィリン等、p型半導体のパーフルオロ体(パーフルオロペンタセンやパーフルオロフタロシアニン等)、ナフタレンテトラカルボン酸無水物、ナフタレンテトラカルボン酸ジイミド、ペリレンテトラカルボン酸無水物、ペリレンテトラカルボン酸ジイミド等の芳香族カルボン酸無水物やそのイミド化物を骨格として含む高分子化合物等を挙げることができる。
図1は、バルクヘテロジャンクション型の有機光電変換素子からなる太陽電池を示す断面図である。図1において、バルクヘテロジャンクション型の有機光電変換素子10は、基板11の一方面上に、透明電極12、バルクヘテロジャンクション層の光電変換部14及び対電極13が順次積層されている。
次に、以上説明したバルクヘテロジャンクション型の有機光電変換素子10を応用した光センサアレイについて詳細に説明する。光センサアレイは、前記のバルクヘテロジャンクション型の有機光電変換素子が受光によって電流を発生することを利用して、前記の光電変換素子を細かく画素状に並べて作製し、光センサアレイ上に投影された画像を電気的な信号に変換する効果を有するセンサである。
<比較の有機光電変換素子1の作製>
ガラス基板上に、インジウム・スズ酸化物(ITO)透明導電膜を110nm堆積したもの(シート抵抗13Ω/□)を、通常のフォトリソグラフィ技術と塩酸エッチングとを用いて2mm幅にパターニングして、透明電極を形成した。
上記有機光電変換素子1の作製において、p型半導体材料をプレクストロニクス社製プレックスコアOS2100に代えて、表1に記載した比較化合物1及び本発明の例示化合物に変更した以外は、比較の有機光電変換素子1と同様にして有機光電変換素子2〜8を得た。なお、有機光電変換素子2〜8に使用した材料のHPLCで測定した純度も併記した。
Jornal of American Chemical Society,vol.129(2007),p14372を参考として合成した。
11、21 基板
12、22 透明電極
13、23 対電極
14、24 光電変換部
14′ 第1の光電変換部
15 電荷再結合層
16 第2の光電変換部
17 正孔輸送層
18 電子輸送層
20 光センサアレイ
Claims (12)
- 前記D 1 及びD 2 は、それぞれ独立に、前記d1、d2及びd4で表される構造を有する芳香族環から選ばれる芳香族環を表し、A 1 及びA 2 は、それぞれ独立に、前記a3、a6、a8、a10、a12、a14、a15、a16、a18、a19、a21、a30、a31、a32及びa33で表される構造を有する芳香族環から選ばれる芳香族環を表し、前記置換基は、アルキル基を表すことを特徴とする請求項1に記載の有機光電変換素子。
- 前記一般式(1)〜(4)で表される低分子化合物が、p型半導体材料としてバルクヘテロジャンクション層に含まれることを特徴とする請求項1又は2に記載の有機光電変換素子。
- 前記バルクヘテロジャンクション層に、p型半導体材料として前記一般式(1)〜(4)で表される低分子化合物と、n型半導体材料としてフラーレン誘導体が含まれることを特徴とする請求項1〜3のいずれか1項に記載の有機光電変換素子。
- 前記一般式(1)〜(4)で表される低分子化合物およびフラーレン誘導体を含有するバルクヘテロジャンクション層が、溶液プロセスによって形成されていることを特徴とする請求項1〜4のいずれか1項に記載の有機光電変換素子。
- 前記一般式(1)〜(4)で表される低分子化合物であって、高速液体クロマトグラフィーで測定した純度が99%以上の純度を有する低分子化合物を用いて製膜されていることを特徴とする請求項1〜5のいずれか1項に記載の有機光電変換素子。
- 前記一般式(1)〜(4)で表される低分子化合物におけるN 1 で表される芳香族炭化水素環が、置換または無置換のベンゼン環であることを特徴とする請求項1〜6のいずれか1項に記載の有機光電変換素子。
- 前記D 1 及びD 2 は、それぞれ独立に、前記d1で表される構造を有する芳香族環を表すことを特徴とする請求項1〜7のいずれか1項に記載の有機光電変換素子。
- 前記A 1 及びA 2 は、それぞれ独立に、前記a16又はa21で表される構造を有する芳香族環を表すことを特徴とする請求項1〜8のいずれか1項に記載の有機光電変換素子。
- 前記一般式(3)で表される化合物を、バルクヘテロジャンクション層に含有することを特徴とする請求項1〜9のいずれか1項に記載の有機光電変換素子。
- 請求項1〜10のいずれか1項に記載の有機光電変換素子からなることを特徴とする太陽電池。
- 請求項1〜10のいずれか1項に記載の有機光電変換素子がアレイ状に配置されてなることを特徴とする光センサアレイ。
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