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