Highly efficient exciton harvesting and charge transport in ternary blend solar cells based on wide- and low-bandgap polymers.

• Wang, Yanbin

• 大北, 英生

• Benten, Hiroaki

• Ito, Shinzaburo

抄録

We have designed highly efficient ternary blend solar cells based on a wide-bandgap crystalline polymer, poly(3-hexylthiophene) (P3HT), and a low-bandgap polymer, poly[(4, 4'-bis(2-ethylhexyl)dithieno[3, 2-b:2'3'-d]silole)-2, 6-diyl-alt-(2, 1, 3-benzothiadiazole)-4, 7-diyl] (PSBTBT), and a fullerene derivative (PCBM). By using highly crystalline P3HT, high fill factors were obtained even for ternary blend solar cells, suggesting efficient charge transport due to large P3HT crystalline domains. In such large crystalline domains, some P3HT excitons could not diffuse into the interface with PCBM but can be collected in PSBTBT domains by efficient energy transfer because of large spectral overlap between the P3HT fluorescence and the PSBTBT absorption. Consequently, all the P3HT excitons can contribute to the photocurrent generation at the P3HT/PCBM interface and/or PSBTBT domains mixed with PCBM in the ternary blends. As a result, P3HT/PSBTBT/PCBM ternary blend solar cells exhibit a power conversion efficiency of 5.6%, which is even higher than those of both individual binary devices of P3HT/PCBM and PSBTBT/PCBM.

Accepted 21 Sep 2015

収録刊行物

• Physical chemistry chemical physics : PCCP

  Physical chemistry chemical physics : PCCP 17 (40), 27217-27224, 2015-10-28

  Royal Society of Chemistry

詳細情報

• CRID: 1050564285772290560
• NII論文ID: 120005689176
• NII書誌ID: AA11301773
• ISSN: 14639076
• HANDLE: 2433/203019
• 本文言語コード: en
• 資料種別: journal article
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