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Article Abstract
An understanding on the influence of the type of demulsifier used on the degree of crystallization in emulsion process-grown organic-inorganic halide perovskite nanocrystals is presently lacking. We conducted a detailed investigation on the structural and optical properties of methylammonium lead bromide (CHNHPbBr) nano-structures synthesized using the emulsion-ligand-assisted re-precipitation method with three different demulsifiers (acetone, -butanol, and butanol). Structural analysis conducted using X-ray diffraction, HRTEM, and Raman studies showed that -butanol served as the best demulsifier among the three. A homogenous distribution of spherically shaped nanoparticles with a particle size of ∼16 nm was achieved using the optimized synthesis process. CHNHPbBr nano-crystals inherent to the cubic 3̄ (221) space group with preferential orientation along the (200) and (201) planes were synthesized. The CHNHPbBr nano-crystals dispersed in toluene exhibited a green photoluminescence at ∼532 nm, which yielded a color purity of 94.6% and carrier lifetime of 1.69 ns.
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