Solution-Processed and High-Performance Organic Solar Cells Using Small Molecules with a Benzodithiophene Unit

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• 作者：Jiaoyan Zhou ; Yi Zuo ; Xiangjian Wan ; Guankui Long ; Qian Zhang ; Wang Ni ; Yongsheng Liu ; Zhi Li ; Guangrui He ; Chenxi Li ; Bin Kan ; Miaomiao Li ; Yongsheng Chen
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：June 12, 2013
• 年：2013
• 卷：135
• 期：23
• 页码：8484-8487
• 全文大小：286K
• 年卷期：v.135,no.23(June 12, 2013)
• ISSN：1520-5126

文摘

Three small molecules named DR3TBDTT, DR3TBDTT-HD, and DR3TBD2T with a benzo[1,2-b:4,5-b鈥瞉dithiophene (BDT) unit as the central building block have been designed and synthesized for solution-processed bulk-heterojunction solar cells. Power conversion efficiencies (PCEs) of 8.12% (certified 7.61%) and 8.02% under AM 1.5G irradiation (100 mW cm^鈥?) have been achieved for DR3TBDTT- and DR3TBDT2T-based organic photovoltaic devices (OPVs) with PC₇₁BM as the acceptor, respectively. The better PCEs were achieved by improving the short-circuit current density without sacrificing the high open-circuit voltage and fill factor through the strategy of incorporating the advantages of both conventional small molecules and polymers for OPVs.