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 |
Summary: | 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. |
---|