Optoelectronics of inverted type-I CdS/CdSe core/crown quantum ring
Inverted type-I heterostructure core/crown quantum rings (QRs) are quantum-efficient luminophores, whose spectral characteristics are highly tunable. Here, we study the optoelectronic properties of type-I core/crown CdS/CdSe QRs in the zincblende phase—over contrasting lateral size and crown width....
Saved in:
Main Authors: | , , |
---|---|
Other Authors: | |
Format: | Article |
Language: | English |
Published: |
2017
|
Subjects: | |
Online Access: | https://hdl.handle.net/10356/86624 http://hdl.handle.net/10220/44192 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Nanyang Technological University |
Language: | English |
id |
sg-ntu-dr.10356-86624 |
---|---|
record_format |
dspace |
spelling |
sg-ntu-dr.10356-866242020-03-07T13:57:29Z Optoelectronics of inverted type-I CdS/CdSe core/crown quantum ring Bose, Sumanta Fan, Weijun Zhang, Dao Hua School of Electrical and Electronic Engineering Centre for OptoElectronics and Biophotonics LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays Metalloids Band Structure Inverted type-I heterostructure core/crown quantum rings (QRs) are quantum-efficient luminophores, whose spectral characteristics are highly tunable. Here, we study the optoelectronic properties of type-I core/crown CdS/CdSe QRs in the zincblende phase—over contrasting lateral size and crown width. For this, we inspect their strain profiles, transition energies, transition matrix elements, spatial charge densities, electronic bandstructures, band-mixing probabilities, optical gain spectra, maximum optical gains, and differential optical gains. Our framework uses an effective-mass envelope function theory based on the 8-band k ⋅ p method employing the valence force field model for calculating the atomic strain distributions. The gain calculations are based on the density-matrix equation and take into consideration the excitonic effects with intraband scattering. Variations in the QR lateral size and relative widths of core and crown (ergo the composition) affect their energy levels, band-mixing probabilities, optical transition matrix elements, emission wavelengths/intensities, etc. The optical gain of QRs is also strongly dimension and composition dependent with further dependency on the injection carrier density causing the band-filling effect. They also affect the maximum and differential gain at varying dimensions and compositions. ASTAR (Agency for Sci., Tech. and Research, S’pore) MOE (Min. of Education, S’pore) EDB (Economic Devt. Board, S’pore) Published version 2017-12-22T01:50:48Z 2019-12-06T16:26:00Z 2017-12-22T01:50:48Z 2019-12-06T16:26:00Z 2017 Journal Article Bose, S., Fan, W., & Zhang, D. H. (2017). Optoelectronics of inverted type-I CdS/CdSe core/crown quantum ring. Journal of Applied Physics, 122(16), 163102-. 0021-8979 https://hdl.handle.net/10356/86624 http://hdl.handle.net/10220/44192 10.1063/1.4986638 en Journal of Applied Physics © 2017 American Institute of Physics (AIP). This paper was published in Journal of Applied Physics and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: [http://dx.doi.org/10.1063/1.4986638]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 10 p. application/pdf |
institution |
Nanyang Technological University |
building |
NTU Library |
country |
Singapore |
collection |
DR-NTU |
language |
English |
topic |
Metalloids Band Structure |
spellingShingle |
Metalloids Band Structure Bose, Sumanta Fan, Weijun Zhang, Dao Hua Optoelectronics of inverted type-I CdS/CdSe core/crown quantum ring |
description |
Inverted type-I heterostructure core/crown quantum rings (QRs) are quantum-efficient luminophores, whose spectral characteristics are highly tunable. Here, we study the optoelectronic properties of type-I core/crown CdS/CdSe QRs in the zincblende phase—over contrasting lateral size and crown width. For this, we inspect their strain profiles, transition energies, transition matrix elements, spatial charge densities, electronic bandstructures, band-mixing probabilities, optical gain spectra, maximum optical gains, and differential optical gains. Our framework uses an effective-mass envelope function theory based on the 8-band k ⋅ p method employing the valence force field model for calculating the atomic strain distributions. The gain calculations are based on the density-matrix equation and take into consideration the excitonic effects with intraband scattering. Variations in the QR lateral size and relative widths of core and crown (ergo the composition) affect their energy levels, band-mixing probabilities, optical transition matrix elements, emission wavelengths/intensities, etc. The optical gain of QRs is also strongly dimension and composition dependent with further dependency on the injection carrier density causing the band-filling effect. They also affect the maximum and differential gain at varying dimensions and compositions. |
author2 |
School of Electrical and Electronic Engineering |
author_facet |
School of Electrical and Electronic Engineering Bose, Sumanta Fan, Weijun Zhang, Dao Hua |
format |
Article |
author |
Bose, Sumanta Fan, Weijun Zhang, Dao Hua |
author_sort |
Bose, Sumanta |
title |
Optoelectronics of inverted type-I CdS/CdSe core/crown quantum ring |
title_short |
Optoelectronics of inverted type-I CdS/CdSe core/crown quantum ring |
title_full |
Optoelectronics of inverted type-I CdS/CdSe core/crown quantum ring |
title_fullStr |
Optoelectronics of inverted type-I CdS/CdSe core/crown quantum ring |
title_full_unstemmed |
Optoelectronics of inverted type-I CdS/CdSe core/crown quantum ring |
title_sort |
optoelectronics of inverted type-i cds/cdse core/crown quantum ring |
publishDate |
2017 |
url |
https://hdl.handle.net/10356/86624 http://hdl.handle.net/10220/44192 |
_version_ |
1681036532388986880 |