An Alkylated Indacenodithieno[3, 2‐b]thiophene‐Based Nonfullerene Acceptor with High Crystallinity Exhibiting Single Junction Solar Cell Efficiencies Greater than 13% with Low Voltage Losses. Issue 13 (30th March 2018) - Fei, Zhuping; Eisner, Flurin D.; Jiao, Xuechen; Azzouzi, Mohammed; Röhr, Jason A.; Han, Yang; Shahid, Munazza; Chesman, Anthony S. R.; Easton, Christopher D.; McNeill, Christopher R.; Anthopoulos, Thomas D.; Nelson, Jenny; et al.