Effect of thickness on the electronic structure and optical properties of quasi two-dimensional perovskite CsPbBr₃ nanoplatelets
The effect of thickness of cesium lead halide perovskite CsPbBr3 nanoplatelets (NPLs) on their electronic structure and optical properties are investigated using an effective-mass envelope function theory based on the 8- band k⋅p model with the consideration of exciton binding energy. We first rep...
Saved in:
Main Authors: | , , , , , , |
---|---|
Other Authors: | |
Format: | Article |
Language: | English |
Published: |
2022
|
Subjects: | |
Online Access: | https://hdl.handle.net/10356/156370 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Nanyang Technological University |
Language: | English |
id |
sg-ntu-dr.10356-156370 |
---|---|
record_format |
dspace |
spelling |
sg-ntu-dr.10356-1563702022-05-06T08:19:21Z Effect of thickness on the electronic structure and optical properties of quasi two-dimensional perovskite CsPbBr₃ nanoplatelets Chen, Qiran Wang, Zhaojin Song, Zhigang Fan, Weijun Wang, Kai Kim, Munho Zhang, Dao Hua School of Electrical and Electronic Engineering Engineering::Electrical and electronic engineering Nanoplatelets CsPbBr₃ The effect of thickness of cesium lead halide perovskite CsPbBr3 nanoplatelets (NPLs) on their electronic structure and optical properties are investigated using an effective-mass envelope function theory based on the 8- band k⋅p model with the consideration of exciton binding energy. We first reported the CsPbBr3 nanoplatelets’ band structure and optical gain with exciton effect. As the thickness of NPLs decreases, their bandgap increases and the band mixing is more obvious which influences the transition matrix element (TME). The optical gain of CsPbBr3 nanoplatelets is calculated by taking into account of TME, Fermi factor, injected carrier density and thickness. A blue shift of peak position in optical gain can be observed as the thickness of NPLs decreases. As the injected carrier density arises, the maximum optical gain of thicker NPLs reach saturation much faster than the thinner ones. To obtain high differential gain, NPLs with less thickness are better choices. Experimental work is carried out and the results agree with our theoretical results very well. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) National Research Foundation (NRF) This work was sponsored by Singapore MOE AcRF Tier 1 RG87/17, MOE T2EP50120-0003 and AStar (grant No: 1720700038). We would like to thank Prof. J. B. Li and Dr. L. Huang for the effective mass calculation. WJ Fan would like to acknowledge the support from NRF–CRP19–2017–01. 2022-05-06T08:19:21Z 2022-05-06T08:19:21Z 2021 Journal Article Chen, Q., Wang, Z., Song, Z., Fan, W., Wang, K., Kim, M. & Zhang, D. H. (2021). Effect of thickness on the electronic structure and optical properties of quasi two-dimensional perovskite CsPbBr₃ nanoplatelets. Journal of Luminescence, 239, 118392-. https://dx.doi.org/10.1016/j.jlumin.2021.118392 0022-2313 https://hdl.handle.net/10356/156370 10.1016/j.jlumin.2021.118392 239 118392 en NRF–CRP19–2017–01 RG87/17 MOE T2EP50120-0003 1720700038 Journal of Luminescence © 2021 Elsevier B.V. All rights reserved. |
institution |
Nanyang Technological University |
building |
NTU Library |
continent |
Asia |
country |
Singapore Singapore |
content_provider |
NTU Library |
collection |
DR-NTU |
language |
English |
topic |
Engineering::Electrical and electronic engineering Nanoplatelets CsPbBr₃ |
spellingShingle |
Engineering::Electrical and electronic engineering Nanoplatelets CsPbBr₃ Chen, Qiran Wang, Zhaojin Song, Zhigang Fan, Weijun Wang, Kai Kim, Munho Zhang, Dao Hua Effect of thickness on the electronic structure and optical properties of quasi two-dimensional perovskite CsPbBr₃ nanoplatelets |
description |
The effect of thickness of cesium lead halide perovskite CsPbBr3 nanoplatelets (NPLs) on their electronic
structure and optical properties are investigated using an effective-mass envelope function theory based on the 8-
band k⋅p model with the consideration of exciton binding energy. We first reported the CsPbBr3 nanoplatelets’
band structure and optical gain with exciton effect. As the thickness of NPLs decreases, their bandgap increases
and the band mixing is more obvious which influences the transition matrix element (TME). The optical gain of
CsPbBr3 nanoplatelets is calculated by taking into account of TME, Fermi factor, injected carrier density and
thickness. A blue shift of peak position in optical gain can be observed as the thickness of NPLs decreases. As the
injected carrier density arises, the maximum optical gain of thicker NPLs reach saturation much faster than the
thinner ones. To obtain high differential gain, NPLs with less thickness are better choices. Experimental work is
carried out and the results agree with our theoretical results very well. |
author2 |
School of Electrical and Electronic Engineering |
author_facet |
School of Electrical and Electronic Engineering Chen, Qiran Wang, Zhaojin Song, Zhigang Fan, Weijun Wang, Kai Kim, Munho Zhang, Dao Hua |
format |
Article |
author |
Chen, Qiran Wang, Zhaojin Song, Zhigang Fan, Weijun Wang, Kai Kim, Munho Zhang, Dao Hua |
author_sort |
Chen, Qiran |
title |
Effect of thickness on the electronic structure and optical properties of quasi two-dimensional perovskite CsPbBr₃ nanoplatelets |
title_short |
Effect of thickness on the electronic structure and optical properties of quasi two-dimensional perovskite CsPbBr₃ nanoplatelets |
title_full |
Effect of thickness on the electronic structure and optical properties of quasi two-dimensional perovskite CsPbBr₃ nanoplatelets |
title_fullStr |
Effect of thickness on the electronic structure and optical properties of quasi two-dimensional perovskite CsPbBr₃ nanoplatelets |
title_full_unstemmed |
Effect of thickness on the electronic structure and optical properties of quasi two-dimensional perovskite CsPbBr₃ nanoplatelets |
title_sort |
effect of thickness on the electronic structure and optical properties of quasi two-dimensional perovskite cspbbr₃ nanoplatelets |
publishDate |
2022 |
url |
https://hdl.handle.net/10356/156370 |
_version_ |
1734310281587195904 |