I2–II–IV–VI4 (I = Cu, Ag; II = Sr, Ba; IV = Ge, Sn; VI = S, Se): Chalcogenides for Thin-Film Photovoltaics - Zhu, Tong; Huhn, William P; Wessler, Garrett C; Shin, Donghyeop; Saparov, Bayrammurad; Mitzi, David B; Blum, Volker (Chemistry of materials, 2017)