2,1,3-Benzothiadiazole-5,6-Dicarboxylic Imide - A Versatile Building Block for Additive-and Annealing-Free Processing of Organic Solar Cells with Effi ciencies Exceeding 8% - Nielsen,CB; Ashraf,RS; Treat,ND; Schroeder,BC; Donaghey,JE; White,AJP; Stingelin,N; McCulloch,I (ADVANCED MATERIALS, 2015)