Improving Photovoltaic Performance of the Linear A-Ar-A-type Small Molecules with Diketopyrropyrrole Arms by Tuning the Linkage Position of the Anthracene Core

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• 作者：Xiongwei Duan ; Manjun Xiao ; Jianhua Chen ; Xiangdong Wang ; Wenhong Peng ; Linrui Duan ; Hua Tan ; Gangtie Lei ; Renqiang Yang ; Weiguo Zhu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：August 26, 2015
• 年：2015
• 卷：7
• 期：33
• 页码：18292-18299
• 全文大小：489K
• ISSN：1944-8252

文摘

Two isomeric A-Ar-A-type small molecules of DPP₂An(9,10) and DPP₂An(2,6), were synthesized with two acceptor arms of diketopyrropyrroles (DPP) and a planar aryl hydrocarbon core of the different substituted anthracene (An), respectively. Their thermal stability, crystallinity, optoelectronic, and photovoltaic performances were investigated. Significantly red-shifted absorption profile and higher HOMO level were observed for the DPP₂An(2,6) with 2,6-substituted anthracene relative to the DPP₂An(9,10) with 9,10-substituted anthracene, as the former exhibited better planarity and a larger conjugate system. As a result, the solution-processing solar cells based on DPP₂An(2,6) and PC₇₁BM (w/w,1:1) displayed remarkably increased power conversion efficiency of 5.44% and short-circuit current density (J_sc) of 11.90 mA/cm² under 1% 1,8-diiodooctane additive. The PCE and J_sc values were 3.7 and 2.9 times those of the optimized DPP₂An(9,10)-based cells, respectively. This work demonstrates that changing the linkage position of the anthracene core in the A-Ar-A-type SMs can strongly improve the photovoltaic properties in organic solar cells.