Mobile ion induced slow carrier dynamics in organic–inorganic perovskite CH3NH3PbBr3

Sheng Chen, Xiaoming Wen*, Rui Sheng, Shujuan Huang, Xiaofan Deng, Martin A. Green, Anita Ho-Baillie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

91 Citations (Scopus)


Here, we investigate photoluminescence (PL) and time-resolved photoluminescence (TRPL) in CH3NH3PbBr3 perovskite under continuous illumination, using optical and electro-optical techniques. Under continuous excitation at constant intensity, PL intensity and PL decay (carrier recombination) exhibit excitation intensity dependent reductions in the time scale of seconds to minutes. The enhanced nonradiative recombination is ascribed to light activated negative ions and their accumulation which exhibit a slow dynamics in a time scale of seconds to minutes. The observed result suggests that the organic–inorganic hybrid perovskite is a mixed electronic–ionic semiconductor. The key findings in this work suggest that ions are photoactivated or electro-activated and their accumulation at localized sites can result in a change of carrier dynamics. The findings are therefore useful for the understanding of instability of perovskite solar cells and shed light on the necessary strategies for performance improvement.

Original languageEnglish
Pages (from-to)5351-5357
Number of pages7
JournalACS Applied Materials and Interfaces
Issue number8
Publication statusPublished - 2 Mar 2016
Externally publishedYes


  • perovskite
  • slow carrier dynamics
  • mobile ions
  • nonradiative recombination
  • light soaking


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