Mapping Nonfullerene Acceptors with a Novel Wide Bandgap Polymer for High Performance Polymer Solar Cells

Liao, Xunfan; Yao, Zhaoyang; Gao, Ke; Shi, Xueliang; Zuo, Lijian; Zhu, Zonglong; Chen, Lie; Liu, Feng; Chen, Yiwang; Jen, Alex K. ‐Y.

doi:10.1002/aenm.201801214

Mapping Nonfullerene Acceptors with a Novel Wide Bandgap Polymer for High Performance Polymer Solar Cells

Journal Article · Mon Jun 25 00:00:00 EDT 2018 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201801214· OSTI ID:1457092

Liao, Xunfan ^[1]; Yao, Zhaoyang ^[2]; ^[2]; Shi, Xueliang ^[2]; Zuo, Lijian ^[2]; Zhu, Zonglong ^[2]; Chen, Lie ^[3]; Liu, Feng ^[4]; Chen, Yiwang ^[3]; ^[5]

Department of Materials Science and Engineering University of Washington Seattle WA 98195‐2120 USA, Institute of Polymers College of Chemistry Nanchang University Nanchang 330031 China
Department of Materials Science and Engineering University of Washington Seattle WA 98195‐2120 USA
Institute of Polymers College of Chemistry Nanchang University Nanchang 330031 China
Department of Physics and Astronomy Shanghai Jiaotong University Shanghai 200240 China
Department of Materials Science and Engineering University of Washington Seattle WA 98195‐2120 USA, Department of Chemistry and Department of Materials Science &, Engineering City University of Hong Kong Kowloon 999077 Hong Kong

Abstract

A new weak electron‐deficient building block, bis(2‐ethylhexyl) 2,5‐bis(5‐bromothiophen‐2‐yl) thieno[3,2‐ b ]thiophene‐3,6‐dicarboxylate ( TT‐Th ), is incorporated to construct a wide‐bandgap (1.88 eV) polymer PBDT‐TT for nonfullerene polymer solar cells (NF‐PSCs). PBDT‐TT possesses suitable energy levels and complementary absorption when blended with both ITIC analogues ( ITIC and IT‐M ) and a near‐infrared (NIR) acceptor ( 6TIC ). Moreover, PBDT‐TT exhibits good conjugated planarity and preferable face‐on orientation in the blended thin film, which are beneficial for charge transfer and carrier transport. The PSCs based on PBDT‐TT : IT‐M and PBDT‐TT : 6TIC blend films yield high power conversion efficiencies of 11.38% and 11.03%, respectively. To the best of the authors' knowledge, the PCE of 11.03% for PBDT‐TT : 6TIC‐ based device is one of the highest values reported for NIR NF‐PSCs. This work demonstrates that TT‐Th is a useful new electron‐accepting building block for making p‐type wide bandgap polymers for efficient NIR NF‐PSCs.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1457092

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 24 Vol. 8; ISSN 1614-6832

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

Country of Publication:: Germany

Language:: English

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