標題: Selenophene-Incorporated Quaterchalcogenophene-Based Donor-Acceptor Copolymers To Achieve Efficient Solar Cells with J(sc) Exceeding 20 mA/cm(2)
作者: Cao, Fong-Yi
Tseng, Cheng-Chun
Lin, Fang-Yu
Chen, Yuzhong
Yan, He
Cheng, Yen-Ju
應用化學系
Department of Applied Chemistry
公開日期: 12-Dec-2017
摘要: Three selenophene-incorporated quaterchalcogenophene-based donoracceptor copolymers PFBT2Th2Se, PFBT2Se2Th, and PFBT4Se are designed and synthesized. To systematically fine-tune the molecular properties and investigate the chalcogen effect, PFBT2Th2Se and PFBT2Se2Th hybridize two thiophenes and two selenophenes as the donor with different isomeric main-chain placement while thiophene-free PFBT4Se uses quaterselenophene as the donor. On account of the selenophenes advantageous features such as higher quinoidal population and higher molecular polarizability, the three polymers show good light-harvesting ability, strong intermolecular interactions, high crystallinity, and high charge mobilities. Bulk-heterojunction solar cells incorporating these selenophene-containing polymers have exhibited promising photovoltaic performance with impressive current densities over 20 mA/cm(2). The device with the PFBT2Se2Th:PC71BM blend showed a PCE of 9.02% with a J(sc) of 21.02 mA/cm(2). In addition, the device using quaterselenophene-based PFBT4Se:PC71BM blend exhibited a PCE of 8.92% with a superior J(sc) of 22.63 mA/cm(2) which represents one of the highest current densities from polymer:fullerene-based solar cells reported in the literature.
URI: http://dx.doi.org/10.1021/acs.chemmater.7b03688
http://hdl.handle.net/11536/144245
ISSN: 0897-4756
DOI: 10.1021/acs.chemmater.7b03688
期刊: CHEMISTRY OF MATERIALS
Volume: 29
起始頁: 10045
結束頁: 10052
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