Regio‐Regular Polymer Acceptors Enabled by Determined Fluorination on End Groups for All‐Polymer Solar Cells with 15.2 % Efficiency

Yu, Han; Pan, Mingao; Sun, Rui; Agunawela, Indunil; Zhang, Jianquan; Li, Yuhao; Qi, Zhenyu; Han, Han; Zou, Xinhui; Zhou, Wentao; Chen, Shangshang; Lai, Joshua Yuk Lin; Luo, Siwei; Luo, Zhenghui; Zhao, Dahui; Lu, Xinhui; Ade, Harald; Huang, Fei; Min, Jie; Yan, He

doi:10.1002/ange.202016284

Regio‐Regular Polymer Acceptors Enabled by Determined Fluorination on End Groups for All‐Polymer Solar Cells with 15.2 % Efficiency

Journal Article · Wed Mar 17 00:00:00 EDT 2021 · Angewandte Chemie

DOI:https://doi.org/10.1002/ange.202016284· OSTI ID:1786033

^[1]; Pan, Mingao ^[2]; Sun, Rui ^[3]; Agunawela, Indunil ^[4]; ^[5]; Li, Yuhao ^[6]; Qi, Zhenyu ^[2]; Han, Han ^[7]; Zou, Xinhui ^[2]; Zhou, Wentao ^[2]; Chen, Shangshang ^[2]; Lai, Joshua Yuk Lin ^[2]; Luo, Siwei ^[2]; Luo, Zhenghui ^[5]; Zhao, Dahui ^[7]; Lu, Xinhui ^[6]; Ade, Harald ^[4]; Huang, Fei ^[8]; Min, Jie ^[9]; ^[10]

The Institute for Advanced Studies Wuhan University Wuhan 430072 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 & Reconstruction Hong Kong University of Science and Technology Clear Water Bay Kowloon; Hong Kong 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 &, Reconstruction Hong Kong University of Science and Technology Clear Water Bay Kowloon, Hong Kong 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 USA
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 &, Reconstruction Hong Kong University of Science and Technology Clear Water Bay Kowloon, Hong Kong China
Department of Physics Chinese University of Hong Kong New Territories Hong Kong 999077 China
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
Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China
The Institute for Advanced Studies Wuhan University Wuhan 430072 China, Key Laboratory of Materials Processing and Mold Zhengzhou University Ministry of Education 450002 Zhengzhou 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 & Reconstruction Hong Kong University of Science and Technology Clear Water Bay Kowloon; Hong Kong 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

Polymerization sites of small molecule acceptors (SMAs) play vital roles in determining device performance of all‐polymer solar cells (all‐PSCs). Different from our recent work about fluoro‐ and bromo‐ co‐modified end group of IC‐FBr (a mixture of IC‐FBr1 and IC‐FBr2), in this paper, we synthesized and purified two regiospecific fluoro‐ and bromo‐ substituted end groups (IC‐FBr‐ o & IC‐FBr‐ m ), which were then employed to construct two regio‐regular polymer acceptors named PYF‐T‐ o and PYF‐T‐ m , respectively . In comparison with its isomeric counterparts named PYF‐T‐ m with different conjugated coupling sites, PYF‐T‐ o exhibits stronger and bathochromic absorption to achieve better photon harvesting. Meanwhile, PYF‐T‐ o adopts more ordered inter‐chain packing and suitable phase separation after blending with the donor polymer PM6, which resulted in suppressed charge recombination and efficient charge transport. Strikingly, we observed a dramatic performance difference between the two isomeric polymer acceptors PYF‐T‐ o and PYF‐T‐ m . While devices based on PM6:PYF‐T‐ o can yield power conversion efficiency (PCE) of 15.2 %, devices based on PM6:PYF‐T‐ m only show poor efficiencies of 1.4 %. This work demonstrates the success of configuration‐unique fluorinated end groups in designing high‐performance regular polymer acceptors, which provides guidelines towards developing all‐PSCs with better efficiencies.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1786033

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 18 Vol. 133; ISSN 0044-8249

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

Country of Publication:: Germany

Language:: English

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