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

Bong Woo Kim, Jin Hyuck Heo, Jin Kyoung Park, David Sunghwan Lee, Hyunik Park, Seong Yeon Kim, Jun Ho Kim, Sang Hyuk Im

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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 22,298 cd/m2, CEmax of 36.65 cd/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.

Original languageEnglish
Pages (from-to)417-425
Number of pages9
JournalJournal of Industrial and Engineering Chemistry
Volume97
DOIs
Publication statusPublished - 2021 May 25

Keywords

  • Anti-solvent dripping
  • Crystallization
  • Diffusion
  • Inorganic metal halide perovskite
  • Light emitting diode

ASJC Scopus subject areas

  • Chemical Engineering(all)

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