Growth Kinetics and Optical Properties of CsPbBr 3 Perovskite Nanocrystals

Sung Hun Kim, Kyoung-Duck Park and Hong Seok Lee
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Sung Hun Kim: Department of Physics, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju 54896, Korea
Kyoung-Duck Park: Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
Hong Seok Lee: Department of Physics, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju 54896, Korea

Energies, 2021, vol. 14, issue 2, 1-7

Abstract: We synthesized CsPbBr 3 perovskite nanocrystals (NCs) at different reaction temperatures and tracked their growth kinetics on the basis of their optical properties and estimated size. The energies of the absorption and fluorescence (FL) peaks with increasing reaction temperature for the CsPbBr 3 perovskite NCs were tuned within the regions of 2.429–2.570 eV and 2.391–2.469 eV, respectively, depending on size of the NCs (9.9–12.5 nm). The Stokes shifts of CsPbBr 3 perovskite NCs with increasing NC size decreased from 101 meV to 38 meV. The full-width at half-maximum of the FL peaks for the CdSe NCs decreased from 150 meV to 90 meV because of the improved size uniformity of the CsPbBr 3 perovskite NCs. The energy spacing of CsPbBr 3 perovskite NCs synthesized at various reaction temperatures was calculated from Tauc plots; this information is critical for determining the bandgap energy and enables the size of the CsPbBr 3 perovskite NCs to be estimated using the effective mass approximation.

Keywords: perovskite nanocrystals; CsPbBr 3; growth kinetics; energy spacing; effective mass approximation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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