JP2010258143A - 有機光電変換素子 - Google Patents
有機光電変換素子 Download PDFInfo
- Publication number
- JP2010258143A JP2010258143A JP2009105053A JP2009105053A JP2010258143A JP 2010258143 A JP2010258143 A JP 2010258143A JP 2009105053 A JP2009105053 A JP 2009105053A JP 2009105053 A JP2009105053 A JP 2009105053A JP 2010258143 A JP2010258143 A JP 2010258143A
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- Prior art keywords
- photoelectric conversion
- layer
- conversion element
- conversion layer
- organic
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Abstract
【解決手段】透明基板上に少なくとも透明導電層を有する陽極、光電変換層、陰極をそれぞれ有する有機薄膜光電変換素子において、該光電変換層が含フッ素アクリル系化合物を含有していることを特徴とする有機光電変換素子。
【選択図】なし
Description
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、陽極12、正孔輸送層15、光電変換層14、電子輸送層16及び陰極13が順次積層されている。
本発明に係る含フッ素アクリル系化合物とは、フッ素含有アクリル酸エステルまたはフッ素含有メタアクリル酸エステルを単量体とする、オリゴマー及びポリマーである。これらオリゴマー及びポリマーは、単独重合のものでも、共重合のものでもよい。
本発明に係る光電変換層に用いられるp型半導体材料としては、種々の縮合多環芳香族低分子化合物や共役系ポリマー・オリゴマーが挙げられる。
本発明に係る光電変換層に用いられる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。
本発明の有機光電変換素子は、光電変換層と陽極との中間には正孔輸送層を、光電変換層で発生した電荷をより効率的に取り出すことが可能となるため、これらの層を有していることが好ましい。
本発明に係る透明電極は陰極、陽極は特に限定せず、素子構成により選択することができるが、好ましくは透明電極を陽極として用いることである。例えば、陽極として用いる場合、好ましくは380〜800nmの光を透過する電極である。材料としては、例えば、インジウムチンオキシド(ITO)、SnO2、ZnO等の透明導電性金属酸化物、金、銀、白金等の金属薄膜、金属ナノワイヤー、カーボンナノチューブ用いることができる。
対電極は導電材単独層であってもよいが、導電性を有する材料に加えて、これらを保持する樹脂を併用してもよい。対電極の導電材としては、仕事関数の小さい(4eV以下)金属、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが用いられる。
基板側から光電変換される光が入射する場合、基板はこの光電変換される光を透過させることが可能な、即ちこの光電変換すべき光の波長に対して透明な部材であることが好ましい。
電子受容体と電子供与体とが混合された光電変換層、輸送層、電極の形成方法としては、蒸着法、塗布法(キャスト法、スピンコート法を含む)等を例示することができる。このうち、光電変換層の形成方法としては、蒸着法、塗布法(キャスト法、スピンコート法を含む)等を例示することができる。このうち、前述の正孔と電子が電荷分離する界面の面積を増大させ、高い光電変換効率を有する素子を作製するためには、塗布法が好ましい。また、塗布法は製造速度にも優れている。
本発明に係る電極、光電変換層、正孔輸送層、電子輸送層等をパターニングする方法やプロセスには特に制限はなく、公知の手法を適宜適用することができる。
《有機光電変換素子STC−1》
バリア層を有するPENフィルム(全光透過率90%)上にITOを平均膜厚150nmで蒸着し、陽極TC−1を作製した。
有機光電変換素子STC−1において、光電変換層用塗布液として、P3HT(プレクストロニクス製:レジオレギュラーポリ−3−ヘキシルチオフェン)(Mw=52000、高分子p型半導体材料)を3.0質量%、PCBM(Mw=911、低分子n型半導体材料)(フロンティアカーボン:6,6−フェニル−C61−ブチリックアシッドメチルエステル)を3.0質量%、F−Ac1(ポリ(パーフルオロオクチル)エチルアクリレート、重量平均分子量Mw:約5000)を0.5mg/mlで混合した液を調製して用いた以外は同様にして、有機光電変換素子STC−2を作製した。
有機光電変換素子STC−2において、F−Ac1の代わりに表1に示すような含フッ素化合物に変更した以外は同様にして、有機光電変換素子STC−3〜6を作製した。表1中の含フッ素アクリル系化合物は下記の通りである。それぞれの重量平均分子量Mwは約5000である。
F−Ac3:(パーフルオロオクチル)エチルアクリレート/メチルメタクリレート共重合体(共重合体比30:70)
F−Ac4:(パーフルオロブチル)エチルメタクリレート/メチルメタクリレート共重合体(共重合体比15:85)
F−Ac5:(パーフルオロブチル)エチルメタクリレート/メチルメタクリレート共重合体(共重合体比5:95)。
《光電変換効率》
ガラス製の封止キャップとUV硬化樹脂を用いて封止を行った有機光電変換素子に、ソーラシュミレーター(AM1.5G)の光を100mW/cm2の強度で照射して、電圧−電流特性を測定し、光電変換効率を求めた。即ち、各有機光電変換素子について、I−Vテスターを用いて室温にて電流−電圧特性を測定し、短絡電流密度(Jsc)、開放電圧(Voc)、及び形状因子(F.F.)を求め、これらから光電変換効率(η(%))を求めた。なお、太陽電池の光電変換効率(η(%))は、下記式(A)に基づいて算出した。
ここで、Pは入射光強度[mW/cm2]、Vocは開放電圧[V]、Jscは短絡電流密度[mA・cm−2]、F.F.は形状因子を示す。
11 基板
12 陽極
13 陰極
14 光電変換層
14p p層
14i i層
14n n層
15 正孔輸送層
16 電子輸送層
Claims (3)
- 透明基板上に少なくとも透明導電層を有する陽極、光電変換層、陰極をそれぞれ有する有機薄膜光電変換素子において、該光電変換層が含フッ素アクリル系化合物を含有していることを特徴とする有機光電変換素子。
- 前記含フッ素アクリル系化合物の分子中の炭素原子に対するフッ素原子の比(F/C)が0.15〜1.0であることを特徴とする請求項1に記載の有機光電変換素子。
- 前記光電変換層が塗布法により形成されることを特徴とする請求項1または2に記載の有機光電変換素子。
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Cited By (3)
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WO2012002246A1 (ja) * | 2010-07-02 | 2012-01-05 | コニカミノルタホールディングス株式会社 | 有機光電変換素子およびそれを用いた太陽電池 |
JP2013526031A (ja) * | 2010-04-22 | 2013-06-20 | コミサリア ア レネルジー アトミック エ オ ゼネルジー アルテルナティブ | 電気的活性層を含みかつ垂直分離を有する有機バルクヘテロ接合太陽電池 |
JP2016519440A (ja) * | 2013-05-10 | 2016-06-30 | エルジー・ケム・リミテッド | 光活性層、これを含む有機太陽電池およびその製造方法 |
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Cited By (6)
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JP2013526031A (ja) * | 2010-04-22 | 2013-06-20 | コミサリア ア レネルジー アトミック エ オ ゼネルジー アルテルナティブ | 電気的活性層を含みかつ垂直分離を有する有機バルクヘテロ接合太陽電池 |
WO2012002246A1 (ja) * | 2010-07-02 | 2012-01-05 | コニカミノルタホールディングス株式会社 | 有機光電変換素子およびそれを用いた太陽電池 |
JP5692228B2 (ja) * | 2010-07-02 | 2015-04-01 | コニカミノルタ株式会社 | 有機光電変換素子およびそれを用いた太陽電池 |
US9634261B2 (en) | 2010-07-02 | 2017-04-25 | Konica Minolta Inc. | Organic photoelectric conversion element and solar cell using same |
JP2016519440A (ja) * | 2013-05-10 | 2016-06-30 | エルジー・ケム・リミテッド | 光活性層、これを含む有機太陽電池およびその製造方法 |
US9923144B2 (en) | 2013-05-10 | 2018-03-20 | Lg Chem, Ltd. | Photoactive layer, organic solar cell comprising same, and manufacturing method therefor |
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