Size-Dependent Phase Transition in Perovskite Nanocrystals.

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ID: 27376
2019
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Abstract
Complex structure of halide and oxide perovskites strongly affect their physical properties. Here the effect of reduced dimensions to the nanoscale has been investigated by a combination of single-dot optical experiments with a phase transition theory. Methylammonium lead bromide (CH3NH3PbBr3) nanocrystals with two average particle sizes of ~2 and ~4 nm with blue- and green-photoluminescence, respectively, were spectrally and temporally probed on a single particle level from 5 K to 295 K. The results show that the abrupt blue-shift of the photoluminescence spectra and lifetimes at ~150 K can be attributed to the cubic-to-tetragonal phase transition in the large 4 nm nanocrystals, while this phase transition is completely absent for the small 2 nm particles in the investigated temperature range. Theoretical calculations based on Landau theory reveal strong size-dependent effect on temperature-induced phase transitions in individual CH3NH3PbBr3 nanocrystals, corroborating experimental observations. This effect should be considered in structure-property analysis of ultra-small perovskite crystals.
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liu2019sizedependentthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Liu, Lige;Zhao, Ru;Xiao, Changtao;Zhang, Feng;Pevere, Federico;Shi, Kebin;Huang, Houbing;Zhong, Hai-Zheng;Sychugov, Ilya;
Journal The journal of physical chemistry letters
Year 2019
DOI
10.1021/acs.jpclett.9b02058
URL
Keywords Keywords not found

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