Effect of Alkylsilyl Side‐Chain Structure on Photovoltaic Properties of Conjugated Polymer Donors

Bin, Haijun; Yang, Yankang; Peng, Zhengxing; Ye, Long; Yao, Jia; Zhong, Lian; Sun, Chenkai; Gao, Liang; Huang, He; Li, Xiaojun; Qiu, Beibei; Xue, Lingwei; Zhang, Zhi‐Guo; Ade, Harald; Li, Yongfang

doi:10.1002/aenm.201702324

Effect of Alkylsilyl Side‐Chain Structure on Photovoltaic Properties of Conjugated Polymer Donors

Journal Article · Mon Dec 04 00:00:00 EST 2017 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201702324· OSTI ID:1411253

Bin, Haijun ^[1]; Yang, Yankang ^[1]; Peng, Zhengxing ^[2]; Ye, Long ^[2]; Yao, Jia ^[3]; Zhong, Lian ^[3]; Sun, Chenkai ^[3]; Gao, Liang ^[3]; Huang, He ^[3]; Li, Xiaojun ^[3]; Qiu, Beibei ^[3]; Xue, Lingwei ^[3]; Zhang, Zhi‐Guo ^[3]; Ade, Harald ^[2]; Li, Yongfang ^[4]

CAS Research/Education Center for Excellence in Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China, School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences Beijing 100049 China
Department of Physics and Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA
CAS Research/Education Center for Excellence in Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
CAS Research/Education Center for Excellence in Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China, School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences Beijing 100049 China, Laboratory of Advanced Optoelectronic Materials College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou Jiangsu 215123 China

Abstract

Side‐chain engineering is an important strategy for optimizing photovoltaic properties of organic photovoltaic materials. In this work, the effect of alkylsilyl side‐chain structure on the photovoltaic properties of medium bandgap conjugated polymer donors is studied by synthesizing four new polymers J70 , J72 , J73 , and J74 on the basis of highly efficient polymer donor J71 by changing alkyl substituents of the alkylsilyl side chains of the polymers. And the photovoltaic properties of the five polymers are studied by fabricating polymer solar cells (PSCs) with the polymers as donor and an n‐type organic semiconductor (n‐OS) m ‐ITIC as acceptor. It is found that the shorter and linear alkylsilyl side chain could afford ordered molecular packing, stronger absorption coefficient, higher charge carrier mobility, thus results in higher J _sc and fill factor values in the corresponding PSCs. While the polymers with longer or branched alkyl substituents in the trialkylsilyl group show lower‐lying highest occupied molecular orbital energy levels which leads to higher V _oc of the PSCs. The PSCs based on J70 : m ‐ITIC and J71 : m ‐ITIC achieve power conversion efficiency (PCE) of 11.62 and 12.05%, respectively, which are among the top values of the PSCs reported in the literatures so far.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1411253

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 8 Vol. 8; ISSN 1614-6832

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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