A thieno[3,4-<i>b</i>]thiophene linker enables a low-bandgap fluorene-cored molecular acceptor for efficient non-fullerene solar cells

Abstract

By introducing a thieno[3,4-<italic>b</italic>]thiophene linker, a low-bandgap fluorene-cored molecular acceptor was achieved, delivering a high PCE of 9.02%.