Synthesis and Photovoltaic Properties of Copolymers from Benzodithiophene and Thiazole

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• 作者：Miao Yang ; Bo Peng ; Bo Liu ; Yingping Zou ; Kechao Zhou ; Yuehui He ; Chunyue Pan ; Yongfang Li
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：October 21, 2010
• 年：2010
• 卷：114
• 期：41
• 页码：17989-17994
• 全文大小：313K
• 年卷期：v.114,no.41(October 21, 2010)
• ISSN：1932-7455

文摘

Two new D−A conjugated polymers containing a benzodithiophene donor unit and the acceptor unit of bithiazole (BTz) or thiazolothiazole (TzTz), P1 and P2, were synthesized by Stille cross-coupling polymerization. The thermal, optical, and electrochemical properties were well investigated. Bulk heterojunction polymer solar cell devices based on an active layer of electron donor copolymers, P1 and P2, blended with electron acceptor [6,6]-phenyl-C₇₁ butyric acid methyl ester (PC₇₁BM) in a weight ratio of 1:2 were explored; the external quantum efficiency (EQE) measurements showed a peak external quantum efficiency of 45% for P1 and P2. The first result of the PSC device with P2 and PC₇₁BM in a weight ratio of 1:2 gave an overall power conversion efficiency (PCE) of 2.6%, an open-circuit voltage of 0.77 V, a short-circuit current of 6.68 mA/cm², and a fill factor of 0.51, under the illumination of AM1.5, 100 mW/cm².