Luminescence and thermal behaviors of free and trapped excitons in cesium lead halide perovskite nanosheets

Nanoscale
Xiangzhou LaoShijie Xu

Abstract

Very recently, all-inorganic perovskite CsPbX3 (X = Cl, Br, I) nanostructures such as nanoparticles, nanoplates, and nanorods have been extensively explored. These CsPbX3 nanostructures exhibit excellent optical properties; however, the photophysics involved is not yet clear. Herein, the emission properties and luminescence mechanism of CsPbBr3 nanosheets (NSs) were investigated using steady-state and time-resolved photoluminescence (PL) spectroscopic techniques. Moreover, two kinds of excitonic emissions (Peak 1 and Peak 2) are observed at low temperatures (<80 K) under the conditions of low excitation level. They are revealed to stem from the radiative recombination of trapped and free excitons by examining their spectral features and emission intensity dependences on excitation power. Thermally induced exchange between the two kinds of excitons is found and modeled quantitatively; this has led to the determination of an activation energy of 13 meV. Thermal redistribution of trapped excitons and thermal expansion-induced blueshift of the bandgap are jointly responsible for the abnormal temperature dependence of the position of Peak 1, whereas the latter is predominant for the monotonic blueshift of the position of Peak 2 with...Continue Reading

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Citations

Sep 19, 2019·Advanced Materials·Bo YangJiang Tang
Nov 15, 2020·The Journal of Chemical Physics·Daniel RossiDong Hee Son
May 5, 2021·ACS Applied Materials & Interfaces·Linyuan LianJianbing Zhang
Jul 14, 2021·The Journal of Physical Chemistry Letters·Hui PengBingsuo Zou
Jul 21, 2021·The Journal of Physical Chemistry Letters·Linyuan LianJianbing Zhang
Jun 23, 2020·ACS Energy Letters·Javad ShamsiSamuel D Stranks
Jul 25, 2019·Journal of the American Chemical Society·Romain GautierFlorian Massuyeau
Nov 19, 2019·ACS Applied Materials & Interfaces·Peipei DuJiang Tang
Nov 11, 2020·The Journal of Physical Chemistry Letters·Yongqiang JiNikolai V Gaponenko
Sep 21, 2021·The Journal of Physical Chemistry Letters·J A PetersB W Wessels

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Methods Mentioned

BETA
scanning electron microscopy
atomic force microscopy
AFM
confocal microscopy

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