Small Molecules Based on Benzo[1,2-b:4,5-b鈥瞉dithiophene Unit for High-Performance Solution-Processed Organic Solar Cells

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• 作者：Jiaoyan Zhou ; Xiangjian Wan ; Yongsheng Liu ; Yi Zuo ; Zhi Li ; Guangrui He ; Guankui Long ; Wang Ni ; Chenxi Li ; Xuncheng Su ; Yongsheng Chen
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：October 3, 2012
• 年：2012
• 卷：134
• 期：39
• 页码：16345-16351
• 全文大小：463K
• 年卷期：v.134,no.39(October 3, 2012)
• ISSN：1520-5126

文摘

Small molecules, namely, DCAO₃TBDT and DR₃TBDT, with 2-ethylhexoxy substituted BDT as the central building block and octyl cyanoacetate and 3-ethylrhodanine as different terminal units with the same linkage of dioctyltertthiophene, have been designed and synthesized. The photovoltaic properties of these two molecules as donors and fullerene derivatives as the acceptors in bulk heterojunction solar cells are studied. Among them, DR₃TBDT shows excellent photovoltaic performance, and power conversion efficiency as high as 7.38% (certified 7.10%) under AM 1.5G irradiation (100 mW cm^鈥?) has been achieved using the simple solution spin-coating fabrication process, which is the highest efficiency reported to date for any small-molecule-based solar cells. The results demonstrate that structure fine turning could cause significant performance difference and with that the performance of solution-processed small-molecule solar cells can indeed be comparable with or even surpass their polymer counterparts.