Morphology controlled nanocrystalline CsPbBr3 thin-film for metal halide perovskite light emitting diodes

Morphology and crystal grain size of inorganic CsPbBr3 metal halide perovskite (MHP) films are controllable through a diffusion-controlled anti-solvent dripping crystallization method using an antisolvent mixture of toluene (Tol):isopropanol (IPA). The 8:2 (v:v) Tol:IPA anti-solvent enables the production of a pinhole-free CsPbBr3 MHP film with the smallest crystal grain size and the brightest photoluminescence (PL). Accordingly, the 8:2 CsPbBr3 MHP film reveals a very uniform and strong PL mapping image. As a result, the 8:2 CsPbBr3 MHP light emitting diode (LED) exhibits similar to 12.8, similar to 7.4, and similar to 7.9 fold enhanced maximum electroluminescence (ELmax), current efficiency (CEmax), and external quantum efficiency (EQE(max)) compared to the 10:0 pristine device. The optimized 8:2 MHP LED shows an ELmax of 22,298 cd/m(2), CEmax of 36.65 cd/A and EQE(max) of 9.64%, respectively. In addition, the 8:2 CsPbBr3 MHP LED with controlled morphology and grain size has better operating stability than the pristine device. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

Automated summary

The morphology and crystal grain size of inorganic CsPbBr3 metal halide perovskite films can be controlled through a diffusion-controlled anti-solvent dripping crystallization method. The optimized 8:2 CsPbBr3 MHP LED shows significantly enhanced performance and better operating stability compared to the pristine device.