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.
KW - luminescence decay
KW - wide bandgap semiconductors
KW - strained layer superlattice
UR - http://www.scopus.com/inward/record.url?scp=0025412764&partnerID=8YFLogxK
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 -