Enhancing the performance of the electron acceptor ITIC-Th via tailoring its end groups

Zeyuan Li; Shuixing Dai; Jingming Xin; Lin Zhang; Yang Wu; Jeromy Rech; Fuwen Zhao; Tengfei Li; Kuan Liu; Qiao Liu; Wei Ma; Wei You; Chunru Wang; Xiaowei Zhan

doi:10.1039/C7QM00547D

Enhancing the performance of the electron acceptor ITIC-Th via tailoring its end groups†

Zeyuan Li,‡^a Shuixing Dai,‡^a Jingming Xin,^b Lin Zhang,^b Yang Wu,^b Jeromy Rech,

^c Fuwen Zhao,^d Tengfei Li,^a Kuan Liu,^a Qiao Liu,^a Wei Ma,^b Wei You,

^c Chunru Wang

^d and Xiaowei Zhan

*^a

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* Corresponding authors

^a Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, China
E-mail: xwzhan@pku.edu.cn

^b State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China

^c Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA

^d Institute of Chemistry, Chinese Academy of Sciences, Beijing, China

Abstract

We choose the high-performance nonfullerene acceptor ITIC-Th as an example, and incorporate electron-donating methoxy and electron-withdrawing F groups onto the terminal group 1,1-dicyanomethylene-3-indanone (IC) to construct a small library of four fused-ring electron acceptors. With this series, we systematically investigate the effects of the substituents on the end-groups on the electronic properties, charge transport, film morphology, and photovoltaic properties of the ITIC-Th series. The electron-withdrawing ability increases from methoxylated to unsubstituted, fluorinated, and difluorinated IC, leading to a downshift of energy levels and a redshift of absorption spectra. Optimized organic solar cells based on the ITIC-Th series show power conversion efficiencies ranging from 8.88% to 12.1%.

This article is part of the themed collection: 13th International Symposium on Functional π-Electron Systems

Materials Chemistry Frontiers

Enhancing the performance of the electron acceptor ITIC-Th via tailoring its end groups†

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Enhancing the performance of the electron acceptor ITIC-Th via tailoring its end groups

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