A-π-D-π-A type Small Molecules Using Ethynylene Linkages for Organic Solar Cells with High Open-circuit Voltages

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• 作者：Ke Gao ; Liangang Xiao ; Yuanyuan Kan ; Lisheng Li ; Yajing Yan ; Huadong Huang ; Junbiao Peng ; Yong Cao and Xiaobin Peng
• 关键词：organic solar cells ; high open circuit voltage ; ethynylene linkages ; no solvent additive ; no post-treatment
• 刊名：Chinese Journal of Chemistry
• 出版年：2016
• 出版时间：April, 2016
• 年：2016
• 卷：34
• 期：4
• 页码：353-358
• 全文大小：1964K
• ISSN：1614-7065

文摘

Introducing ethynylene linkages in a conjugated molecule can deepen the HOMO level, decrease the steric constraints and better delocalize the π electrons and so on, which are beneficial for organic solar cells. Furthermore, the typical method of introducing acetylene linkages by Sonogashira reactions can avoid the usage of toxic stannyl intermediates and potentially dangerous lithiation reactions. In this study, two simple small molecules BEDPP and NEDPP are designed and synthesized, in which two diketopyrrolopyrrole units are symmetrically connected to benzene and naphthalene cores, respectively, via acetylene linkages. And the BHJ (Bulk Heterojunction) solar cells based on BEDPP and NEDPP without using solvent additive and without any post-treatment for the active layers provide us power conversion efficiencies of 1.48% and 2.31% with remarkably high open circuit voltages up to 0.90 and 0.98 V, respectively.