Colloidal CsPbX3 (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability. - Krieg F; Ochsenbein ST; Yakunin S; Ten Brinck S; Aellen P; Süess A; Clerc B; Guggisberg D; Nazarenko O; Shynkarenko Y; Kumar S; Shih CJ; et al. (ACS energy letters, 2018)