Porosity-induced blueshift of photoluminescence in CdSe

E. Monaico; V. V. Ursaki; I. M. Tiginyanu; Z. Dashevsky; V. Kasiyan; Robert W. Boyd

doi:10.1063/1.2338833

Porosity-induced blueshift of photoluminescence in CdSe

E. Monaico, V. V. Ursaki, I. M. Tiginyanu, Z. Dashevsky, V. Kasiyan, Robert W. Boyd

Department of Materials Engineering

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

14 Scopus citations

Abstract

Porous CdSe layers have been fabricated by anodic etching of n-type single crystalline substrates with different values of conductivity. The morphology and porosity of the layers thus produced were found to be controlled by the conductivity of the material, anodization voltage, and conditions of in situ UV illumination. The porosity-induced changes in the photoluminescence spectra were studied. The decrease of the skeleton size down to 10-20 nm was found to result in a blueshift of the excitonic emission lines by 10 meV which was attributed to quantum-size effects in the nanocrystalline CdSe porous skeleton. An increase of the exciton-LO-phonon interaction by a factor of 1.5 in a weak-to-intermediate confinement regime was deduced from the analysis of temperature dependence of the free exciton luminescence line.

Original language	English
Article number	053517
Journal	Journal of Applied Physics
Volume	100
Issue number	5
DOIs	https://doi.org/10.1063/1.2338833
State	Published - 26 Sep 2006

ASJC Scopus subject areas

General Physics and Astronomy

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title = "Porosity-induced blueshift of photoluminescence in CdSe",

abstract = "Porous CdSe layers have been fabricated by anodic etching of n-type single crystalline substrates with different values of conductivity. The morphology and porosity of the layers thus produced were found to be controlled by the conductivity of the material, anodization voltage, and conditions of in situ UV illumination. The porosity-induced changes in the photoluminescence spectra were studied. The decrease of the skeleton size down to 10-20 nm was found to result in a blueshift of the excitonic emission lines by 10 meV which was attributed to quantum-size effects in the nanocrystalline CdSe porous skeleton. An increase of the exciton-LO-phonon interaction by a factor of 1.5 in a weak-to-intermediate confinement regime was deduced from the analysis of temperature dependence of the free exciton luminescence line.",

author = "E. Monaico and Ursaki, {V. V.} and Tiginyanu, {I. M.} and Z. Dashevsky and V. Kasiyan and Boyd, {Robert W.}",

note = "Funding Information: This work was supported by the U.S. Civilian Research and Development Foundation under Grants Nos. ME2-2527 and MOR2-1033-CH-03. ",

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T1 - Porosity-induced blueshift of photoluminescence in CdSe

AU - Monaico, E.

AU - Ursaki, V. V.

AU - Tiginyanu, I. M.

AU - Dashevsky, Z.

AU - Kasiyan, V.

AU - Boyd, Robert W.

N1 - Funding Information: This work was supported by the U.S. Civilian Research and Development Foundation under Grants Nos. ME2-2527 and MOR2-1033-CH-03.

PY - 2006/9/26

Y1 - 2006/9/26

N2 - Porous CdSe layers have been fabricated by anodic etching of n-type single crystalline substrates with different values of conductivity. The morphology and porosity of the layers thus produced were found to be controlled by the conductivity of the material, anodization voltage, and conditions of in situ UV illumination. The porosity-induced changes in the photoluminescence spectra were studied. The decrease of the skeleton size down to 10-20 nm was found to result in a blueshift of the excitonic emission lines by 10 meV which was attributed to quantum-size effects in the nanocrystalline CdSe porous skeleton. An increase of the exciton-LO-phonon interaction by a factor of 1.5 in a weak-to-intermediate confinement regime was deduced from the analysis of temperature dependence of the free exciton luminescence line.

AB - Porous CdSe layers have been fabricated by anodic etching of n-type single crystalline substrates with different values of conductivity. The morphology and porosity of the layers thus produced were found to be controlled by the conductivity of the material, anodization voltage, and conditions of in situ UV illumination. The porosity-induced changes in the photoluminescence spectra were studied. The decrease of the skeleton size down to 10-20 nm was found to result in a blueshift of the excitonic emission lines by 10 meV which was attributed to quantum-size effects in the nanocrystalline CdSe porous skeleton. An increase of the exciton-LO-phonon interaction by a factor of 1.5 in a weak-to-intermediate confinement regime was deduced from the analysis of temperature dependence of the free exciton luminescence line.

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Porosity-induced blueshift of photoluminescence in CdSe

Abstract

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