Single‐Junction Binary‐Blend Nonfullerene Polymer Solar Cells with 12.1% Efficiency

Zhao, Fuwen; Dai, Shuixing; Wu, Yang; Zhang, Qianqian; Wang, Jiayu; Jiang, Li; Ling, Qidan; Wei, Zhixiang; Ma, Wei; You, Wei; Wang, Chunru; Zhan, Xiaowei

doi:10.1002/adma.201700144

Single‐Junction Binary‐Blend Nonfullerene Polymer Solar Cells with 12.1% Efficiency

Journal Article · Fri Mar 10 00:00:00 EST 2017 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201700144· OSTI ID:1400823

Zhao, Fuwen ^[1]; Dai, Shuixing ^[2]; Wu, Yang ^[3]; Zhang, Qianqian ^[4]; Wang, Jiayu ^[5]; Jiang, Li ^[6]; Ling, Qidan ^[7]; Wei, Zhixiang ^[8]; Ma, Wei ^[3]; You, Wei ^[4]; Wang, Chunru ^[6]; Zhan, Xiaowei ^[5]

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, Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
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, Fujian Key Laboratory of Polymer Materials College of Materials Science and Engineering Fujian Normal University Fuzhou 350007 China
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China
Department of Chemistry University of North Carolina at Chapel Hill Chapel Hill NC 27599‐3290 USA
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
Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
Fujian Key Laboratory of Polymer Materials College of Materials Science and Engineering Fujian Normal University Fuzhou 350007 China
National Center for Nanoscience and Technology Beijing 100190 China

A new fluorinated nonfullerene acceptor, ITIC‐Th1, has been designed and synthesized by introducing fluorine (F) atoms onto the end‐capping group 1,1‐dicyanomethylene‐3‐indanone (IC). On the one hand, incorporation of F would improve intramolecular interaction, enhance the push–pull effect between the donor unit indacenodithieno[3,2‐b]thiophene and the acceptor unit IC due to electron‐withdrawing effect of F, and finally adjust energy levels and reduce bandgap, which is beneficial to light harvesting and enhancing short‐circuit current density ( J _SC ). On the other hand, incorporation of F would improve intermolecular interactions through CF···S, CF···H, and CF···π noncovalent interactions and enhance electron mobility, which is beneficial to enhancing J _SC and fill factor. Indeed, the results show that fluorinated ITIC‐Th1 exhibits redshifted absorption, smaller optical bandgap, and higher electron mobility than the nonfluorinated ITIC‐Th. Furthermore, nonfullerene organic solar cells (OSCs) based on fluorinated ITIC‐Th1 electron acceptor and a wide‐bandgap polymer donor FTAZ based on benzodithiophene and benzotriazole exhibit power conversion efficiency (PCE) as high as 12.1%, significantly higher than that of nonfluorinated ITIC‐Th (8.88%). The PCE of 12.1% is the highest in fullerene and nonfullerene‐based single‐junction binary‐blend OSCs. Moreover, the OSCs based on FTAZ:ITIC‐Th1 show much better efficiency and better stability than the control devices based on FTAZ:PC ₇₁ BM (PCE = 5.22%).

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1400823

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 18 Vol. 29; ISSN 0935-9648

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

Country of Publication:: Germany

Language:: English

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