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
Publication statusPublished - 2022 Aug 12

Bibliographical note

Funding Information:
We thank Bo Ram Lee for sharing the device fabrication method. This research was supported by Young Researcher Program and Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (2018R1C1B6008728 and 2018M3D1A1058536). Via our membership of the UK's HEC Materials Chemistry Consortium, which is funded by EPSRC (EP/L000202), this work used the ARCHER UK National Supercomputing Service ( https://www.archer.ac.uk ).

Publisher Copyright:
© 2022 The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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