Sahli, FlorentGuesnay, Quentin Jean-Marie ArmandSalsi, NiccolòDuchêne, LéoBallif, ChristopheJeangros, Quentin2021-08-262021-08-262021-08-262021https://infoscience.epfl.ch/handle/20.500.14299/180825Formamidinium (FA) cations commonly used in perovskite semiconductors tend to form sym-triazine when sublimed in vacuum, a process that hampers the deposition process. Here we find that ammonia, when used as a carrier gas for formamidinium halides transport, cleaves the sym-triazine ring back to formamidinium, hence enhancing the deposition efficiency.perovskitevapor depositionformamidiniumsymtriazineammoniatext::working paper