Carrier recombination mechanism in CsPbB r3 revealed by time-resolved photoluminescence spectroscopy

J. A. Peters, Zhifu Liu, Ruihan Yu, K. M. McCall, Yihui He, M. G. Kanatzidis, B. W. Wessels

Research output: Contribution to journalArticle

Abstract

We systematically investigate the recombination mechanism of photogenerated charge carriers in bulk CsPbBr3 by means of time-resolved photoluminescence (TR-PL) spectroscopy at low temperature and various laser excitation powers. A dynamic recombination model is proposed to describe the TR-PL that predicts the time-dependent exciton and free-charge populations. It provides a clear representation of competing mono- A nd bimolecular recombination processes. A decrease in carrier lifetime with increasing laser intensity was observed that was attributed to exciton-exciton scattering. A bimolecular recombination coefficient of ∼10-7cm3/s was obtained for exciton recombination. As the concentration of photoexcited carriers increases, stronger exciton-exciton annihilation occurs. The exciton-exciton annihilation rate for CsPbBr3 is 3.63×10-7cm3s-1 at 10-mW laser power. Notably, the exciton-exciton annihilation rate in bulk material is comparable to that obtained for photoexcited CsPbBr3 nanoscale quantum dots.

Original languageEnglish
Article number235305
JournalPhysical Review B
Volume100
Issue number23
DOIs
Publication statusPublished - Dec 12 2019

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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