Visualizing Light-Induced Microstrain and Phase Transition in Lead-Free Perovskites Using Time-Resolved X-Ray Diffraction

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

2 Scopus Citations
View graph of relations

Author(s)

  • Yingqi Wang
  • Cunming Liu
  • Xiaobing Zuo
  • Sophie E. Canton
  • Kaibo Zheng
  • Kuangda Lu
  • Xujie Lü
  • Wenge Yang
  • Xiaoyi Zhang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)5335–5341
Journal / PublicationJournal of the American Chemical Society
Volume144
Issue number12
Online published18 Mar 2022
Publication statusPublished - 30 Mar 2022

Abstract

Metal halide perovskites have emerged as promising materials for optoelectronic applications in the last decade. A large amount of effort has been made to investigate the interplay between the crystalline lattice and photoexcited charge carriers as it is vital to their optoelectronic performance. Among them, ultrafast laser spectroscopy has been intensively utilized to explore the charge carrier dynamics of perovskites, from which the local structural information can only be extracted indirectly. Here, we have applied a time-resolved X-ray diffraction technique to investigate the structural dynamics of prototypical two-dimensional lead-free halide perovskite Cs3Bi2Br9 nanoparticles across temporal scales from 80 ps to microseconds. We observed a quick recoverable (a few ns) photoinduced microstrain up to 0.15% and a long existing lattice expansion (∼a few hundred nanoseconds) at mild laser fluence. Once the laser flux exceeds 1.4 mJ/cm2, the microstrain saturates and the crystalline phase partially transfers into a disordered phase. This photoinduced transient structural change can recover within the nanosecond time scale. These results indicate that photoexcitation of charge carriers couples with lattice distortion, which fundamentally affects the dielectric environment and charge carrier transport.

Citation Format(s)

Visualizing Light-Induced Microstrain and Phase Transition in Lead-Free Perovskites Using Time-Resolved X-Ray Diffraction. / Wang, Yingqi; Liu, Cunming; Ren, Yang et al.

In: Journal of the American Chemical Society, Vol. 144, No. 12, 30.03.2022, p. 5335–5341.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review