Russian Journal of General Chemistry. Vol. 92, No. 11, Pages 2354-2362, 2022

Jiaxin Zhang^a, Longfei Liu^b, Huangfen Li^a, Jiamin Cao^a^,*, Yujie Cao^a, Peng Yang^a, Manjun Xiao^b^,**, and Wanqiang Liu^a^,***

^aKey Laboratory of Theoretical Organic Chemistry and Functional Molecules of Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201 China

^bCollege of Chemistry, Key Lab of Environment-Friendly Chemistry and Application (Ministry of Education), Xiangtan University, Xiangtan, 411105 China

Abstract— Two nonfullerene acceptors (NFAs) TT-2FIC and DTP-2FIC were developed by using naphthalene substituted thieno[3,2-b]thiophene as the core, alkylthiophene, alkylthieno[3,2-b]thiophene or 4-alkyl-4H-dithieno[3,2-b:2′,3′-d]pyrrole as the π-bridges. This core could endow NFAs with coplanar backbone and twisted conjugated sidechains. In this way, over-aggregation of NFAs was suppressed, and TT-2FIC and DTP-2FIC exhibited good solubility and optimal π-π stacking. Eventually, PBDB-T:TT-2FIC and PBDB-T:DTP-2FIC cells achieved decent PCE of 4.25% and 4.96%, respectively.

Keywords: organic solar cells, non-fullerene acceptors, thieno[3,2-b]thiophene; aggregation

Nonfullerene Acceptors Based on Naphthalene Substituted Thieno[3,2-b]thiophene Core for Efficient Organic Solar Cells