Pressure‐Induced Perovskite‐to‐non‐Perovskite Phase Transition in CsPbBr3

The expanding range of optoelectronic applications of lead‐halide perovskites requires their production in diverse forms (single crystals, thin‐ and thick‐films or even nanocrystals), motivating the development of diverse materials processing and deposition routes that are specifically suited for th...

Full description

Saved in:
Bibliographic Details
Published in:Helvetica chimica acta 2021-02, Vol.104 (2), p.n/a
Main Authors: Noculak, Agnieszka, Boehme, Simon C., Aebli, Marcel, Shynkarenko, Yevhen, McCall, Kyle M., Kovalenko, Maksym V.
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Atomic structure
Broadband
Cesium
Cesium 133
Cesium isotopes
Crystals
Deposition
Electronics industry
Excitons
Hydrostatic pressure
Lead
lead halides
Lead isotopes
luminescence
Materials processing
Nanocrystals
NMR
NMR spectroscopy
Nuclear magnetic resonance
Optoelectronics
perovskite
Perovskites
Phase transitions
Photoluminescence
Photons
Pressure
Pressure effects
Raman spectroscopy
Single crystals
Spectrum analysis
Temperature dependence
Thick films
Thin films
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The expanding range of optoelectronic applications of lead‐halide perovskites requires their production in diverse forms (single crystals, thin‐ and thick‐films or even nanocrystals), motivating the development of diverse materials processing and deposition routes that are specifically suited for these structurally soft, low‐melting semiconductors. Pressure‐assisted deposition of compact pellets or thick‐films are gaining popularity, necessitating studies on the pressure effects on the atomic structure and properties of the resulting material. Herein we report the phase transformation in bulk polycrystalline cesium lead bromide from its three‐dimensional perovskite phase (γ‐CsPbBr3) into the one‐dimensional polymorph (δ‐CsPbBr3) upon application of hydrostatic pressure (0.35 GPa). δ‐CsPbBr3 is characterized by a wide bandgap of 2.9 eV and broadband yellow luminescence at 585 nm (2.1 eV) originating from self‐trapped excitons. The formation of δ‐CsPbBr3 was confirmed and characterized by Raman spectroscopy, 207Pb and 133Cs solid‐state nuclear magnetic resonance, X‐ray diffraction, absorption spectroscopy, and temperature‐dependent and time‐resolved photoluminescence spectroscopy. No such phase transition was observed in colloidal CsPbBr3 nanocrystals.
ISSN:0018-019X
1522-2675
DOI:10.1002/hlca.202000222