Mapping Nonfullerene Acceptors with a Novel Wide Bandgap Polymer for High Performance Polymer Solar Cells
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 25, 2018
- Source ID
- 10.1002/aenm.201801214
Entities
People
- Alex Jen
- Feng Liu
- Ke Gao
- Lie Chen
- Lijian Zuo
- Xueliang Shi
- Xunfan Liao
- Yiwang Chen
- Zhaoyang Yao
- Zonglong Zhu
Organizations
- China Scholarship Council
- City University of Hong Kong
- Nanchang University
- National Natural Science Foundation of China
- Office of Naval Research
- Shanghai Jiao Tong University
- United States Department of Energy
- University of Washington