Publication date: 6th November 2020
Ionic Liquid based Novel Green Synthesis Approach for Strong Photo-emissive Methylammonium Lead Bromide Perovskite Nanocrystals
Minh Tam Hoang, Ngoc Duy Pham, Yang Yang, Hongxia Wang*
aSchool of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD 4001, Australia.
E-mail: hx.wang@qut.edu.au
The impressive performance of organic-inorganic metal halide perovskites in photovoltaic applications has inspired exploration of this material in form of colloidal nanocrystals (NCs) for other optoelectronic applications due to the unique nature of nanocrystals. Traditionally the solution synthesis process of perovskite often involves use of noxious solvents, which makes them unfavourable for a sustainable industrial productions[1-5]. As one of the key challenges toward commercialization of cheap and reliable perovskite, green chemistry for solution processable perovskite have to be addressed[6]. Herein, we demonstrate a novel synthesis method for Methylammonium lead bromide (MAPbBr3) perovskite NCs at room temperature by using an environmentally friendly methylammonium carboxylate-based protonic ionic liquid. Study of the effects of different carboxylate anion ligand on material properties shows that both the morphology and photoluminescent properties of the perovskite NCs strongly depend on alkyl chain length of the anions. No nanocrystals were formed by using short chain formate whereas MAPbBr3 nanocubes with sizes around 20 nm and nanorods with diameter of 80-90 nm were formed using medium and long alkyl chain of propyl carboxylate and butyl carboxylate, respectively. The as-synthesized NCs exhibited strong green emission with narrow full width at half maximum of ~28 nm, high thin-film photo-luminescent quantum efficiency (PLQE) of 50%, and short radiative life-time of only 6 ns. This ionic liquid enabling method opens a new pathway for a facile, versatile, environmental-friendly synthesis of perovskite NCs which is of high importance for many applications in the future.
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