【作者】 章中强； 刘文清； 鄢杰林； 施敏敏； 陈红征；

【Author】 Zhongqiang Zhang;Wenqing Liu;Jielin Yan;Minmin Shi;Hongzheng Chen;MOE Key Laboratory of Macromolecular Synthesis and Functionalization,State Key Laboratory of Silicon Materials,Department of Polymer Science and Engineering,Zhejiang University;

【机构】 浙江大学高分子科学与工程学系；

【摘要】 为了得到高效的有机光伏器件,调控有机半导体分子的能级结构非常重要。通过在末端噻吩环的2,3位同时引入酯基单元,我们设计并合成了一个基于吡咯并吡咯二酮（DPP）的有机小分子DPP（C₂T₂）₂。由于酯基的吸电子效应,合成分子的能级下降到了合适的水平,HOMO能级-5.37 e V,LUMO能级-3.78 e V,在溶液制备的有机太阳能电池中,既可以作为电子给体,又可以作为受体。最终,DPP（C₂T₂）₂作为给体,PC₇₁BM作为受体时,能量转换效率（PCE）为1.66%;DPP（C₂T₂）₂作为受体,P3HT作为给体时,能量转换效率为1.08%。更多还原

【Abstract】 It is a primary strategy to manipulate the energy levels of organic semiconductor molecules for getting better performances in organic photovoltaic devices. In this paper, we designed and synthesized a diketopyrrolopyrrole(DPP)-based small molecule, 3,6-bis{5-[(diethyl thiophene-2,3-dicarboxylate)-2-yl]thiophene-2-yl}-2,5-bis(2-ethylhexyl)pyrrolo[3,4-c]pyrrole-1,4-dione(DPP(CT)2), by introducing ester groups to both ? and β-position of the end capped thiophene ring. Due to the electron-withdrawing effect of ester group, the resulting molecule exhibits lowered highest occupied molecular orbital(HOMO) energy level of-5.37 e V and lowest unoccupied molecular orbital(LUMO) energy level of-3.78 e V. Therefore, DPP(CT)2 can be used as either electron donor or acceptor for solution processed organic solar cells and shows a power conversion efficiency of 1.66% when blended with [6,6]-phenyl-C71-butyric acid methyl ester(PC71BM) and 1.08% with poly(3-hexylthiophene)(P3HT).更多还原