Fused Dithienogermolodithiophene Low Band Gap Polymers for High-Performance Organic Solar Cells without Processing Additives - Zhong, H; Li, Z; Deledalle, F; Fregoso, EC; Shahid, M; Fei, Z; Nielsen, CB; Yaacobi-Gross, N; Rossbauer, S; Anthopoulos, TD; Durrant, JR; Heeney, M (JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2013)