Photoluminescence of wide bandgap II-VI superlattices

K. P. O'Donnell; P. J. Parbrook; B. Henderson; C. Trager-Cowan; X. Chen; F. Yang; M. P. Halsall; P. J. Wright; B. Cockayne

doi:10.1016/0022-0248(90)91036-P

Photoluminescence of wide bandgap II-VI superlattices

K. P. O'Donnell
, P. J. Parbrook
, B. Henderson
, C. Trager-Cowan
, X. Chen
, F. Yang
, M. P. Halsall
, P. J. Wright
, B. Cockayne

Research output: Contribution to journal › Article › peer-review

Abstract

Photoluminescence (PL) and PL decay measurements are used to characterize typical samples of wide gap II-VI strained layer superlattices (SLSs). The results show that good quality material is obtained for SLSs of ZnSe/ZnS, CdSe/CdS (hex), ZnSe/CdSe and ZnS/CdS using atmospheric pressure MOCVD. Quantum confinement in SLSs is confirmed by the peak shift, temperature dependence and decay characteristics of the exciton luminescence. The PL intensity at low temperatures ( <20 K) shows a weak bistable dependence at low excitation power density in several samples. Transition from excitonic to free-particle behaviour is clear at elevated temperatures. The decay curves are non-exponential, indicating the influence of inhomogeneities and/or impurities. However, lifetimes are uniformly longer than in comparable epilayers. In principle, our results allow us to construct a general band offset diagram for the Zn(Cd)S(Se) family of superlattices.

Original language	English
Pages (from-to)	554-558
Number of pages	5
Journal	Journal of Crystal Growth
Volume	101
Issue number	1-4
DOIs	https://doi.org/10.1016/0022-0248(90)91036-P
Publication status	Published - 1 Apr 1990
Externally published	Yes

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@article{e64f0d7076a54433a54cf3570ac80f3d,

title = "Photoluminescence of wide bandgap II-VI superlattices",

abstract = "Photoluminescence (PL) and PL decay measurements are used to characterize typical samples of wide gap II-VI strained layer superlattices (SLSs). The results show that good quality material is obtained for SLSs of ZnSe/ZnS, CdSe/CdS (hex), ZnSe/CdSe and ZnS/CdS using atmospheric pressure MOCVD. Quantum confinement in SLSs is confirmed by the peak shift, temperature dependence and decay characteristics of the exciton luminescence. The PL intensity at low temperatures ( <20 K) shows a weak bistable dependence at low excitation power density in several samples. Transition from excitonic to free-particle behaviour is clear at elevated temperatures. The decay curves are non-exponential, indicating the influence of inhomogeneities and/or impurities. However, lifetimes are uniformly longer than in comparable epilayers. In principle, our results allow us to construct a general band offset diagram for the Zn(Cd)S(Se) family of superlattices.",

author = "O'Donnell, \{K. P.\} and Parbrook, \{P. J.\} and B. Henderson and C. Trager-Cowan and X. Chen and F. Yang and Halsall, \{M. P.\} and Wright, \{P. J.\} and B. Cockayne",

year = "1990",

month = apr,

day = "1",

doi = "10.1016/0022-0248(90)91036-P",

language = "English",

volume = "101",

pages = "554--558",

journal = "Journal of Crystal Growth",

issn = "0022-0248",

publisher = "Elsevier B.V.",

number = "1-4",

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TY - JOUR

T1 - Photoluminescence of wide bandgap II-VI superlattices

AU - O'Donnell, K. P.

AU - Parbrook, P. J.

AU - Henderson, B.

AU - Trager-Cowan, C.

AU - Chen, X.

AU - Yang, F.

AU - Halsall, M. P.

AU - Wright, P. J.

AU - Cockayne, B.

PY - 1990/4/1

Y1 - 1990/4/1

N2 - Photoluminescence (PL) and PL decay measurements are used to characterize typical samples of wide gap II-VI strained layer superlattices (SLSs). The results show that good quality material is obtained for SLSs of ZnSe/ZnS, CdSe/CdS (hex), ZnSe/CdSe and ZnS/CdS using atmospheric pressure MOCVD. Quantum confinement in SLSs is confirmed by the peak shift, temperature dependence and decay characteristics of the exciton luminescence. The PL intensity at low temperatures ( <20 K) shows a weak bistable dependence at low excitation power density in several samples. Transition from excitonic to free-particle behaviour is clear at elevated temperatures. The decay curves are non-exponential, indicating the influence of inhomogeneities and/or impurities. However, lifetimes are uniformly longer than in comparable epilayers. In principle, our results allow us to construct a general band offset diagram for the Zn(Cd)S(Se) family of superlattices.

AB - Photoluminescence (PL) and PL decay measurements are used to characterize typical samples of wide gap II-VI strained layer superlattices (SLSs). The results show that good quality material is obtained for SLSs of ZnSe/ZnS, CdSe/CdS (hex), ZnSe/CdSe and ZnS/CdS using atmospheric pressure MOCVD. Quantum confinement in SLSs is confirmed by the peak shift, temperature dependence and decay characteristics of the exciton luminescence. The PL intensity at low temperatures ( <20 K) shows a weak bistable dependence at low excitation power density in several samples. Transition from excitonic to free-particle behaviour is clear at elevated temperatures. The decay curves are non-exponential, indicating the influence of inhomogeneities and/or impurities. However, lifetimes are uniformly longer than in comparable epilayers. In principle, our results allow us to construct a general band offset diagram for the Zn(Cd)S(Se) family of superlattices.

UR - https://www.scopus.com/pages/publications/0025412764

U2 - 10.1016/0022-0248(90)91036-P

DO - 10.1016/0022-0248(90)91036-P

M3 - Article

AN - SCOPUS:0025412764

SN - 0022-0248

VL - 101

SP - 554

EP - 558

JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

IS - 1-4

ER -

Photoluminescence of wide bandgap II-VI superlattices

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