Pressure-induced non-radiative losses in halide perovskite light-emitting diodes

Young Kwang Jung, Mayami Abdulla, Richard H. Friend, Samuel D. Stranks, Aron Walsh

Research output: Contribution to journalArticlepeer-review

Abstract

The control of non-radiative losses in light-emitting diodes (LEDs) based on metal halide perovskites is crucial to improve device efficiency. Recent studies have shown a correlation between lattice strain and electron-hole recombination. To consolidate the concept, we investigate how external pressure (strain) affects the crystal structure, electronic properties, point defect concentration, and luminescence efficiency of CH3NH3PbBr3. Relativistic first-principles calculations reveal enhanced Rashba splitting and Schottky defect disorder under compression, which produce a pronounced decrease in the electroluminescence peak energy and intensity in operating CH3NH3PbBr3 LEDs. The resulting model sheds light on the factors underpinning the intricate strain-property relationships in soft crystalline semiconductors.

Original languageEnglish
Pages (from-to)12560-12568
Number of pages9
JournalJournal of Materials Chemistry C
Volume10
Issue number35
DOIs
StatePublished - 12 Aug 2022

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