Ultrathin CdSe quantum wells

K.G. Chinyama; I.V. Bradley; K.P. O'Donnell; P.I. Kuznetsov; A.P. Chernushich; V. Luzanov

doi:10.1016/S0022-0248(98)80063-8

Ultrathin CdSe quantum wells

K.G. Chinyama, I.V. Bradley, K.P. O'Donnell, P.I. Kuznetsov, A.P. Chernushich, V. Luzanov

Physics

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

2 Citations (Scopus)

Abstract

We report a survey of samples containing ultrathin layers of CdSe embedded in ZnSe or ZnS_0.06Se_0.94 matrices. CdSe single quantum wells (SQW) with well widths in the range 0.3-3 ML show several bands in the photon energy range from 1.7 to 2.4 eV. Similar bands have been attributed recently to self-organised quantum dots. Temperature-dependent photoluminescence (PL) shows that the bands in our samples vanish, without significant peak shift, at moderately high temperatures. Preliminary time-resolved PL shows that they also have relatively long lifetimes (ca. 30-250 ns). In all samples, the SQW exciton band lying at higher energies shows line narrowing with increasing temperature. Variations due to quantum-well thickness induce a correlation between the luminescence peak energy and the optical bandwidth which may be used to systematise our observations.

Original language	English
Pages (from-to)	298-301
Number of pages	4
Journal	Journal of Crystal Growth
Volume	184-185
DOIs	https://doi.org/10.1016/S0022-0248(98)80063-8
Publication status	Published - 2 Feb 1998

Keywords

correlation
deep bands
exciton bands
lifetime
line narrowing
photoluminescence

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10.1016/S0022-0248(98)80063-8

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title = "Ultrathin CdSe quantum wells",

abstract = "We report a survey of samples containing ultrathin layers of CdSe embedded in ZnSe or ZnS0.06Se0.94 matrices. CdSe single quantum wells (SQW) with well widths in the range 0.3-3 ML show several bands in the photon energy range from 1.7 to 2.4 eV. Similar bands have been attributed recently to self-organised quantum dots. Temperature-dependent photoluminescence (PL) shows that the bands in our samples vanish, without significant peak shift, at moderately high temperatures. Preliminary time-resolved PL shows that they also have relatively long lifetimes (ca. 30-250 ns). In all samples, the SQW exciton band lying at higher energies shows line narrowing with increasing temperature. Variations due to quantum-well thickness induce a correlation between the luminescence peak energy and the optical bandwidth which may be used to systematise our observations.",

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T1 - Ultrathin CdSe quantum wells

AU - Chinyama, K.G.

AU - Bradley, I.V.

AU - O'Donnell, K.P.

AU - Kuznetsov, P.I.

AU - Chernushich, A.P.

AU - Luzanov, V.

PY - 1998/2/2

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N2 - We report a survey of samples containing ultrathin layers of CdSe embedded in ZnSe or ZnS0.06Se0.94 matrices. CdSe single quantum wells (SQW) with well widths in the range 0.3-3 ML show several bands in the photon energy range from 1.7 to 2.4 eV. Similar bands have been attributed recently to self-organised quantum dots. Temperature-dependent photoluminescence (PL) shows that the bands in our samples vanish, without significant peak shift, at moderately high temperatures. Preliminary time-resolved PL shows that they also have relatively long lifetimes (ca. 30-250 ns). In all samples, the SQW exciton band lying at higher energies shows line narrowing with increasing temperature. Variations due to quantum-well thickness induce a correlation between the luminescence peak energy and the optical bandwidth which may be used to systematise our observations.

AB - We report a survey of samples containing ultrathin layers of CdSe embedded in ZnSe or ZnS0.06Se0.94 matrices. CdSe single quantum wells (SQW) with well widths in the range 0.3-3 ML show several bands in the photon energy range from 1.7 to 2.4 eV. Similar bands have been attributed recently to self-organised quantum dots. Temperature-dependent photoluminescence (PL) shows that the bands in our samples vanish, without significant peak shift, at moderately high temperatures. Preliminary time-resolved PL shows that they also have relatively long lifetimes (ca. 30-250 ns). In all samples, the SQW exciton band lying at higher energies shows line narrowing with increasing temperature. Variations due to quantum-well thickness induce a correlation between the luminescence peak energy and the optical bandwidth which may be used to systematise our observations.

KW - correlation

KW - deep bands

KW - exciton bands

KW - lifetime

KW - line narrowing

KW - photoluminescence

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VL - 184-185

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JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

ER -

Ultrathin CdSe quantum wells

Abstract

Keywords

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