Temperature-dependent excitonic photoluminescence of hybrid organometal halide perovskite films

Kewei Wu, Ashok Bera, Chun Ma, Yuanmin Du, Yang Yang, Liang Li, Tom Wu

Research output: Contribution to journalArticlepeer-review


Organometal halide perovskites have recently attracted tremendous attention due to their potential for photovoltaic applications, and they are also considered as promising materials in light emitting and lasing devices. In this work, we investigated in detail the cryogenic steady state photoluminescence properties of a prototypical hybrid perovskite CH3NH3PbI3-xClx. The evolution of the characteristics of two excitonic peaks coincides with the structural phase transition around 160 K. Our results further revealed an exciton binding energy of 62.3 ± 8.9 meV and an optical phonon energy of 25.3 ± 5.2 meV, along with an abnormal blue-shift of the band gap in the high-temperature tetragonal phase.

Original languageEnglish (US)
Pages (from-to)22476-22481
Number of pages6
JournalPhysical Chemistry Chemical Physics
Issue number41
StatePublished - Oct 1 2014

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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