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

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 97; pp. 417 - 425
• Main Authors: Kim, Bong Woo, Heo, Jin Hyuck, Park, Jin Kyoung, Lee, David Sunghwan, Park, Hyunik, Kim, Seong Yeon, Kim, Jun Ho, Im, Sang Hyuk
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.05.2021; 한국공업화학회
• Subjects: Anti-solvent dripping; Crystallization; Diffusion; Inorganic metal halide perovskite; Light emitting diode; 화학공학; Inorganic metal halide perovskite; Anti-solvent dripping; Diffusion; Crystallization; Light emitting diode
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2021.02.028

[Display omitted] •Morphology and crystal grain size of CsPbBr3 is controllable by diffusion controlled anti-solvent dripping crystallization.•8:2 toluene:isopropanol anti-solvent forms the most uniform and brightest photoluminescence CsPbBr3 film.•The optimized CsPbBr3 LED exhibits 22,298cd/m2 ELmax, 36.65cd/A CEmax, and 9.64% EQEmax. 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 anti-solvent 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 ∼12.8, ∼7.4, and ∼7.9 fold enhanced maximum electroluminescence (ELmax), current efficiency (CEmax), and external quantum efficiency (EQEmax) compared to the 10:0 pristine device. The optimized 8:2 MHP LED shows an ELmax of 22,298cd/m2, CEmax of 36.65cd/A and EQEmax 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.