Mobile charge-induced fluorescence intermittency in methylammonium lead bromide perovskite

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

*Corresponding author for this work

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

Organic-inorganic halide perovskite has emerged as a very promising material for solar cells due to its excellent photovoltaic enabling properties resulting in rapid increase in device efficiency over the last 3 years. Extensive knowledge and in-depth physical understanding in the excited state carrier dynamics are urgently required. Here we investigate the fluorescence intermittency (also known as blinking) in vapor-assisted fabricated CH3NH3PbBr3 perovskite. The evident fluorescence blinking is observed in a dense CH3NH3PbBr3 perovskite film that is composed of nanoparticles in close contact with each other. In the case of an isolated nanoparticle no fluorescence blinking is observed. The ON probability of fluorescence is dependent on the excitation intensity and exhibits a similar power rule to semiconductor quantum dots at higher excitation intensity. As the vapor-assisted fabricated CH3NH3PbBr3 perovskite film is a cluster of nanoparticles forming a dense film, it facilitates mobile charge migration between the nanoparticles and charge accumulation at the surface or at the boundary of the nanoparticles. This leads to enhanced Auger-like nonradiative recombination contributing to the fluorescence intermittency observed. This finding provides unique insight into the charge accumulation and migration and thus is of crucial importance for device design and improvement.

Original languageEnglish
Pages (from-to)4644-4649
Number of pages6
JournalNano Letters
Volume15
Issue number7
DOIs
Publication statusPublished - 8 Jul 2015
Externally publishedYes

Keywords

  • blinking
  • Fluorescence intermittency
  • methylammonium lead bromide
  • mobile charge
  • nanoparticle
  • perovskite

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