Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/154457
Title: Effect of size on the electronic structure and optical properties of cubic CsPbBr₃ quantum dots
Authors: Chen, Qiran
Song, Zhigang
Zhang, Daohua
Sun, Handong
Fan, Weijun
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Chen, Q., Song, Z., Zhang, D., Sun, H. & Fan, W. (2020). Effect of size on the electronic structure and optical properties of cubic CsPbBr₃ quantum dots. IEEE Journal of Quantum Electronics, 56(1), 1-7. https://dx.doi.org/10.1109/JQE.2019.2949639
Project: RG87/17 
1720700038 
Journal: IEEE Journal of Quantum Electronics 
Abstract: The size effect on the electronic structure and optical properties of cubic CsPbBr3 perovskite quantum dots is investigated by using an 8-band k p model based on effective-mass envelope function theory with exciton binding energy consideration. Quantum dots with smaller size have larger bandgaps due to quantum confinement. The transition matrix element (TME) is also influenced by the size. The optical gain of such material is calculated by considering TME, Fermi factor, injected carrier density, quantum dot size, and dephasing rate. Higher density of injected carrier is needed for smaller quantum dot to get a positive optical gain. The peak of optical gain has a blue shift as the size of quantum dot decreases. When the carrier density increases for a quantum dot with certain size, a blue shift in emission peak position can be observed due to band filling effect. Smaller quantum dots have higher differential optical gain at carrier densities within certain range.
URI: https://hdl.handle.net/10356/154457
ISSN: 0018-9197
DOI: 10.1109/JQE.2019.2949639
Rights: © 2019 IEEE. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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