A Difluoro‐Monobromo End Group Enables High‐Performance Polymer Acceptor and Efficient All‐Polymer Solar Cells Processable with Green Solvent under Ambient Condition

Yu, Han; Luo, Siwei; Sun, Rui; Angunawela, Indunil; Qi, Zhenyu; Peng, Zhengxing; Zhou, Wentao; Han, Han; Wei, Rong; Pan, Mingao; Cheung, Andy Man Hong; Zhao, Dahui; Zhang, Jianquan; Ade, Harald; Min, Jie; Yan, He

doi:10.1002/adfm.202100791

A Difluoro‐Monobromo End Group Enables High‐Performance Polymer Acceptor and Efficient All‐Polymer Solar Cells Processable with Green Solvent under Ambient Condition

Journal Article · Sun May 02 00:00:00 EDT 2021 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.202100791· OSTI ID:1781209

^[1]; Luo, Siwei ^[2]; Sun, Rui ^[3]; Angunawela, Indunil ^[4]; Qi, Zhenyu ^[2]; Peng, Zhengxing ^[4]; Zhou, Wentao ^[2]; Han, Han ^[5]; Wei, Rong ^[5]; Pan, Mingao ^[2]; Cheung, Andy Man Hong ^[2]; Zhao, Dahui ^[5]; Zhang, Jianquan ^[1]; Ade, Harald ^[4]; Min, Jie ^[6]; ^[7]

Department of Chemistry Guangdong‐Hong Kong‐Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials Energy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong 999077 China, Hong Kong University of Science and Technology‐Shenzhen Research Institute No. 9, Yuexing 1st RD, Hi‐tech Park, Nanshan Shenzhen 518057 China
Department of Chemistry Guangdong‐Hong Kong‐Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials Energy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong 999077 China
The Institute for Advanced Studies Wuhan University Wuhan 430072 China
Department of Physics and Organic and Carbon Electronics Laboratories (ORaCEL) North Carolina State University Raleigh NC 27695 United States
Beijing National Laboratory for Molecular Sciences Centre for Soft Matter Science and Engineering Key Lab of Polymer Chemistry &, Physics of the Ministry of Education College of Chemistry Peking University Beijing 100871 China
The Institute for Advanced Studies Wuhan University Wuhan 430072 China, Key Laboratory of Materials Processing and Mold Zhengzhou University Ministry of Education Zhengzhou 450002 China
Department of Chemistry Guangdong‐Hong Kong‐Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials Energy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong 999077 China; Hong Kong University of Science and Technology‐Shenzhen Research Institute No. 9; Yuexing 1st RD; Hi‐tech Park; Nanshan Shenzhen 518057 China; Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China

Abstract

In this paper, a difluoro‐monobromo end group is designed and synthesized, which is then used to construct a novel polymer acceptor (named PY2F‐T) yielding high‐performance all‐polymer solar cells with 15.22% efficiency. The fluorination strategy can increase the intramolecular charge transfer and interchain packing of the previous PY‐T based acceptor, and significantly improve photon harvesting and charge mobility of the resulting polymer acceptor. In addition, detailed morphology investigations reveal that the PY2F‐T‐based blend shows smaller domain spacing and higher domain purity, which significantly suppress charge recombination as supported by time‐resolved techniques. These polymer properties enable simultaneously enhanced J _SC and FF of the PY2F‐T‐based devices, eventually delivering device efficiencies of over 15%, significantly outperforming that of the devices based on the non‐fluorinated PY‐T polymer (13%). More importantly, the PY2F‐T‐based active layers can be processed under ambient conditions and still achieve a 14.37% efficiency. They can also be processed using non‐halogenated solvent o ‐xylene (no additive) and yield a decent performance of 13.05%. This work demonstrates the success of the fluorination strategy in the design of high‐performance polymer acceptors, which provide guidelines for developing new all‐PSCs with better efficiencies and stabilities for commercial applications.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1781209

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 25 Vol. 31; ISSN 1616-301X

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

Country of Publication:: Germany

Language:: English

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