Low-bandgap nonfullerene acceptor based on thieno[3,2-b]indole core for highly efficient binary and ternary organic solar cells
Artikel i vetenskaplig tidskrift, 2022

A low-bandgap nonfullerene acceptor (NFA) TIT-2FIC based on thieno[3,2-b]indole-thiophenes core has been developed. Compared with the analogue NFAs DTC(4Ph)-4FIC and IT-4F, TIT-2FIC exhibited remarkably red-shifted absorption, and up-shifted HOMO energy level. In addition, TIT-2FIC showed interesting universal miscibility with the donors nonfluorinated PBDB-T and fluorinated PM6, therefore the corresponding organic solar cells achieved promising power conversion efficiencies (PCEs) of 11.80% and 13.00%, respectively, which are higher compared to the counterpart IT-4F based cells. Furthermore, the ternary PM6:TIT-2FIC:Y6 cell pronounced a high PCE of 17.22%, being significantly improved from that of 16.04% for the binary PM6:Y6 cell. Similar improvement in PCEs from 13.41% to 14.46% was also observed in the ternary PM6:TIT-2FIC:IT-4F cell with TIT-2FIC as the third component. These results indicated that TIT-2FIC is universally applicable as an acceptor with nonfluorinated or fluorinated polymer donor materials in both binary and ternary cells.

Nonfullerene acceptors

Frontier energy levels

Organic solar cells


Power conversion efficiency


Liang Xie

Hunan University of Science and Technology

Yang Zhang

Guilin University of Electronic Technology

Wenliu Zhuang


Guangdong Industry Polytechnic

Sang Young Jeong

Korea University

Qingzhen Bian

Linköpings universitet

Huangfen Li

Hunan University of Science and Technology

Jiamin Cao

Hunan University of Science and Technology

Wanqing Liu

Hunan University of Science and Technology

Hua Tan

Changzhou University

Han Young Woo

Korea University

Jian Zhang

Guilin University of Electronic Technology

Ergang Wang

Zhengzhou University

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Chemical Engineering Journal

1385-8947 (ISSN)

Vol. 427 131674



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