Campus Units

Chemistry, Ames Laboratory

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

8-22-2019

Journal or Book Title

ChemPhysChem

DOI

10.1002/cphc.201900432

Abstract

Lead halide perovskites possess unique characteristics well‐suited for optoelectronic and energy capture devices, however, concerns about their long‐term stability remain. All‐inorganic CsPbX3 (X = Cl, Br, I) perovskite nanocrystals have been reported with improved stability. We investigate the photo‐ and thermal‐stability properties of CsPbX3 (X = Cl, Br, I) nanocrystals by electron microscopy, x‐ray diffraction, thermogravimetric analysis, ensemble and single particle spectral characterization. CsPbBr¬3 is stable under 1‐sun illumination for 16 h in ambient conditions, although single crystal analysis indicates the luminescence states change over time. CsPbBr¬3 is also stable to heating to 250 °C. Large CsPbI3 crystals (34 ± 5 nm) are the least stable under the same conditions; and with heating, the γ (black) phase reverts to the non‐luminescent δ phase. Smaller CsPbI3 nanocrystals (14 ± 2 nm) purified by a different washing strategy exhibit improved photostability with no evidence of crystal growth but are still thermally unstable. Both CsPbCl3 and CsPbBr3 show crystal growth under irradiation or heat, likely with a preferential orientation. TGA‐FTIR reveals nanocrystal mass loss was only from liberation and subsequent degradation of surface ligands. Encapsulation or other protective strategies should be employed for long‐term stability under conditions of high irradiance or temperature.

Comments

This is the peer-reviewed version of the following article: Boote, Brett W., Himashi P. Andaraarachchi, Bryan A. Rosales, Rafael Blome-Fernández, Feng Zhu, Malinda D. Reichert, Kalyan Santra, Jingzhe Li, Jacob W. Petrich, Javier Vela, and Emily A. Smith. "Unveiling the Photo‐and Thermal‐Stability of Cesium Lead Halide Perovskite Nanocrystals." ChemPhysChem. (2019), which has been published in final form at https://doi.org/10.1002/cphc.201900432. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

Copyright Owner

Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim

Language

en

File Format

application/pdf

Available for download on Saturday, August 22, 2020

Published Version

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