A New Nonfullerene Electron Acceptor with a Ladder Type Backbone for High-Performance Organic Solar Cells

Nonfullerene acceptor FDICTF (2,9bis-(2-methylene--(3-(1,1-dicyanomethylene)indanone))-7, 12-dihydro-4, 4, 7, 7, 12, 12-hexaoctyl-4H-cyclopenta[2 '', 1 '': 5, 6; 3 '', 4 '': 5', 6']diindeno[1, 2-b: 1', 2'-b']dithiophene) modified by fusing the fluorene core in a precursor, yields 10.06% high power conversion efficiency, and demonstrates that the ladder and fused core backbone in A-D-A structure molecules is an effective design strategy for high-performance nonfullerene acceptors.