Dessimoz, MarcYoo, So-MinKanda, HiroyukiIgci, CansuKim, HobeomNazeeruddin, Mohammad Khaja2022-02-282022-02-282022-02-282021-11-2510.1021/acs.jpclett.1c03143https://infoscience.epfl.ch/handle/20.500.14299/185786WOS:000753949700013Phase control of low-dimensional metal-halide perovskites (LDPs) greatly affects their optoelectronic properties, and phase-pure LDPs are desirable to achieve efficient perovskite optoelectronic devices such as solar cells and light-emitting diodes. Herein, we introduce a method to obtain phase-pure LDP by using a neutral amine, cyclohexylmethyl amine (CHMA). The incorporation of CHMA into a formamidinium lead bromide (FAPbBr(3)) precursor solution leads to the protonation of the amine that allows the phase transition of 3D FAPbBr(3) to phase-pure quasi-2D perovskite (n = 2). For comparison, cyclohexylmethylammonium bromide (CHMABr), which is a conventional form of ammonium halide salt with the same organic moiety to the amine, is used, which resulted in a 2D perovskite (n = 1). The perovskite films fabricated by the two different methodologies are characterized. This study paves the way for further research on the realization of phase-pure perovskites and their relevant optoelectronic devices.Chemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryPhysics, Atomic, Molecular & ChemicalChemistryScience & Technology - Other TopicsMaterials SciencePhysicslight-emitting-diodessolar-cellefficiencyinterfacetext::journal::journal article::research article