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Phase 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.
Michael Graetzel, Jovana Milic, Joachim Maier, Algirdas Ducinskas, Yuchen Wang, Davide Moia, Mina Jung
Felix Thomas Eickemeyer, Lukas Pfeifer, Hiroaki Jinno, Tommaso Marcato
Quentin Jean-Marie Armand Guesnay