Understanding the Halogenation Effects in Diketopyrrolopyrrole-Based Small Molecule Photovoltaics.

Shi-Xin Sun,Yong Huo,Miao-Miao Li,Xiaowen Hu,Hai-Jun Zhang,You-Wen Zhang,You-Dan Zhang,Xiao-Long Chen,Zi-Fa Shi,Xiong Gong,Yongsheng Chen,Hao-Li Zhang

ACS applied materials & interfaces（2015）

Cited 36|Views4

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Abstract

Two molecules containing a central diketopyrrolopyrrole and two oligothiophene units have been designed and synthesized. Comparisons between the molecules containing terminal F (FDPP) and Cl (CDPP) atoms allowed us to evaluate the effects of halogenation on the photovoltaic properties of the small molecule organic solar cells (OSCs). The OSCs devices employing FDPP:PC71BM films showed power conversion efficiencies up to 4.32%, suggesting that fluorination is an efficient method for constructing small molecules for OSCs.

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Key words

solution-processed small molecules,diketopyrrolopyrrole,organic solar cells,halogenation effect,device optimization

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