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In situ transmission electron microscopy study of electron beam-induced transformations in colloidal cesium lead halide perovskite nanocrystals

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In situ transmission electron microscopy study of electron beam-induced transformations in colloidal cesium lead halide perovskite nanocrystals

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dc.contributor.author	Dang, Zhiya
dc.contributor.author	Shamsi, Javad
dc.contributor.author	Palazón Huet, Francisco
dc.contributor.author	Imran, Muhammad
dc.contributor.author	Akkerman, Quinten A.
dc.contributor.author	Park, Sungwook
dc.contributor.author	Bertoni, Giovanni
dc.contributor.author	Prato, Mirko
dc.contributor.author	Brescia, Rosaria
dc.contributor.author	Manna, Liberato
dc.date.accessioned	2019-09-11T14:42:02Z
dc.date.available	2019-09-11T14:42:02Z
dc.date.issued	2017
dc.identifier.citation	Dang, Zhiya Shamsi, Javad Palazón Huet, Francisco Imran, Muhammad Akkerman, Quinten A. Park, Sungwook Bertoni, Giovanni Prato, Mirko Brescia, Rosaria Manna, Liberato 2017 In Situ Transmission Electron Microscopy Study of Electron Beam-Induced Transformations in Colloidal Cesium Lead Halide Perovskite Nanocrystals Acs Nano 11 2 2124 2132
dc.identifier.uri	https://hdl.handle.net/10550/71494
dc.description.abstract	An increasing number of studies have recently reported the rapid degradation of hybrid and all-inorganic lead halide perovskite nanocrystals under electron beam irradiation in the transmission electron microscope, with the formation of nanometer size, high contrast particles. The nature of these nanoparticles and the involved transformations in the perovskite nanocrystals are still a matter of debate. Herein, we have studied the effects of high energy (80/200 keV) electron irradiation on colloidal cesium lead bromide (CsPbBr3) nanocrystals with different shapes and sizes, especially 3 nm thick nanosheets, a morphology that facilitated the analysis of the various ongoing processes. Our results show that the CsPbBr3 nanocrystals undergo a radiolysis process, with electron stimulated desorption of a fraction of bromine atoms and the reduction of a fraction of Pb2+ ions to Pb0. Subsequently Pb0 atoms diffuse and aggregate, giving rise to the high contrast particles, as previously reported by various groups. The diffusion is facilitated by both high temperature and electron beam irradiation. The early stage Pb nanoparticles are epitaxially bound to the parent CsPbBr3 lattice, and evolve into nonepitaxially bound Pb crystals upon further irradiation, leading to local amorphization and consequent dismantling of the CsPbBr3 lattice. The comparison among CsPbBr3 nanocrystals with various shapes and sizes evidences that the damage is particularly pronounced at the corners and edges of the surface, due to a lower diffusion barrier for Pb0 on the surface than inside the crystal and the presence of a larger fraction of under-coordinated atoms.
dc.language.iso	eng
dc.relation.ispartof	Acs Nano, 2017, vol. 11, num. 2, p. 2124-2132
dc.subject	Nanotecnologia
dc.subject	Electrons
dc.title	In situ transmission electron microscopy study of electron beam-induced transformations in colloidal cesium lead halide perovskite nanocrystals
dc.type	journal article	es_ES
dc.date.updated	2019-09-11T14:42:02Z
dc.identifier.doi	10.1021/acsnano.6b08324
dc.identifier.idgrec	127076
dc.rights.accessRights	open access	es_ES