Open AccessUltrafast carrier dynamics in all-inorganic CsPbBr3 perovskite across the pressure-induced phase transition
Author(s) -
Xiaochun Liu,
Jianhui Han,
You Li,
Bifa Cao,
Chaofan Sun,
Hao Yin,
Ying Shi,
Jin Mu,
Cailong Liu,
Mengtao Sun,
Dajun Ding
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.00a995
Subject(s) - materials science , femtosecond , ultrafast laser spectroscopy , charge carrier , auger effect , phase transition , perovskite (structure) , band gap , carrier lifetime , excited state , ultrashort pulse , photoelectric effect , optoelectronics , relaxation (psychology) , optics , auger , chemical physics , atomic physics , condensed matter physics , laser , chemistry , crystallography , silicon , physics , psychology , social psychology
The excited-state carrier dynamics of lead halide perovskites play a critical role in their photoelectric properties, and are greatly affected by lattice structural changes. In this work, the carrier dynamics of all-inorganic CsPbBr 3 peroveskite, as a function of pressure, are investigated using in situ high-pressure femtosecond transient absorption spectroscopic experiments. Compression is found to drive crystal structural evolution, thereby markedly changing the behavior of charge carriers in CsPbBr 3 . Before the phase transition, simultaneous prolonging of the carrier relaxation and Auger recombination is achieved alongside a narrowing in the bandgap. The results favor improved efficiency and photovoltaic performance.