Comparative structural and optical properties of Ge2Sb 2Te5, In0.3Ge2Sb2Te 5 and Se2Sb2Te6 thin films

N. Qamhieh; S. T. Mahmoud; H. Ghamlouche

Comparative structural and optical properties of Ge₂Sb ₂Te₅, In_0.3Ge₂Sb₂Te ₅ and Se₂Sb₂Te₆ thin films

N. Qamhieh, S. T. Mahmoud, H. Ghamlouche

Department of Physics

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

1 Citation (Scopus)

Abstract

Structural and optical properties of thermally evaporated Ge ₂Sb₂Te₅, In_0.3Ge₂Sb ₂Te₅ and Se₂Sb₂Te₆ thin films are reported. The structural analysis is investigated using X-Ray diffraction measurements from which the lattice constants are calculated and found to be greater for Se₂Sb₂Te₆ films than for Ge₂Sb₂Te₅. The refractive indices are deduced from optical transmission measurements whereas the optical band gap (E_g) is obtained from optical absorption measurements. It is found that Se₂Sb₂Te₆ film has higher optical band gap and lower refractive index than Ge₂Sb₂Te₅ film. This could be attributed to the presence of selenium that has a wider energy gap than Ge. The addition of indium to Ge₂Sb ₂Te₅ alloy leads to a slight increase in the refractive index and the optical gap, but no significant change on the lattice constant is observed.

Original language	English
Pages (from-to)	1995-1999
Number of pages	5
Journal	Journal of Optoelectronics and Advanced Materials
Volume	11
Issue number	12
Publication status	Published - Dec 2009

Keywords

Chalcogenides
Ge-Sb-Te
In-Ge-Sb-Te
Lattice constant
Optical properties
Phase-change
Se-Sb-Te

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Electrical and Electronic Engineering

Cite this

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title = "Comparative structural and optical properties of Ge2Sb 2Te5, In0.3Ge2Sb2Te 5 and Se2Sb2Te6 thin films",

abstract = "Structural and optical properties of thermally evaporated Ge 2Sb2Te5, In0.3Ge2Sb 2Te5 and Se2Sb2Te6 thin films are reported. The structural analysis is investigated using X-Ray diffraction measurements from which the lattice constants are calculated and found to be greater for Se2Sb2Te6 films than for Ge2Sb2Te5. The refractive indices are deduced from optical transmission measurements whereas the optical band gap (Eg) is obtained from optical absorption measurements. It is found that Se2Sb2Te6 film has higher optical band gap and lower refractive index than Ge2Sb2Te5 film. This could be attributed to the presence of selenium that has a wider energy gap than Ge. The addition of indium to Ge2Sb 2Te5 alloy leads to a slight increase in the refractive index and the optical gap, but no significant change on the lattice constant is observed.",

keywords = "Chalcogenides, Ge-Sb-Te, In-Ge-Sb-Te, Lattice constant, Optical properties, Phase-change, Se-Sb-Te",

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T1 - Comparative structural and optical properties of Ge2Sb 2Te5, In0.3Ge2Sb2Te 5 and Se2Sb2Te6 thin films

AU - Qamhieh, N.

AU - Mahmoud, S. T.

AU - Ghamlouche, H.

PY - 2009/12

Y1 - 2009/12

N2 - Structural and optical properties of thermally evaporated Ge 2Sb2Te5, In0.3Ge2Sb 2Te5 and Se2Sb2Te6 thin films are reported. The structural analysis is investigated using X-Ray diffraction measurements from which the lattice constants are calculated and found to be greater for Se2Sb2Te6 films than for Ge2Sb2Te5. The refractive indices are deduced from optical transmission measurements whereas the optical band gap (Eg) is obtained from optical absorption measurements. It is found that Se2Sb2Te6 film has higher optical band gap and lower refractive index than Ge2Sb2Te5 film. This could be attributed to the presence of selenium that has a wider energy gap than Ge. The addition of indium to Ge2Sb 2Te5 alloy leads to a slight increase in the refractive index and the optical gap, but no significant change on the lattice constant is observed.

AB - Structural and optical properties of thermally evaporated Ge 2Sb2Te5, In0.3Ge2Sb 2Te5 and Se2Sb2Te6 thin films are reported. The structural analysis is investigated using X-Ray diffraction measurements from which the lattice constants are calculated and found to be greater for Se2Sb2Te6 films than for Ge2Sb2Te5. The refractive indices are deduced from optical transmission measurements whereas the optical band gap (Eg) is obtained from optical absorption measurements. It is found that Se2Sb2Te6 film has higher optical band gap and lower refractive index than Ge2Sb2Te5 film. This could be attributed to the presence of selenium that has a wider energy gap than Ge. The addition of indium to Ge2Sb 2Te5 alloy leads to a slight increase in the refractive index and the optical gap, but no significant change on the lattice constant is observed.

KW - Chalcogenides

KW - Ge-Sb-Te

KW - In-Ge-Sb-Te

KW - Lattice constant

KW - Optical properties

KW - Phase-change

KW - Se-Sb-Te

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SN - 1454-4164

VL - 11

SP - 1995

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JO - Journal of Optoelectronics and Advanced Materials

JF - Journal of Optoelectronics and Advanced Materials

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ER -

Comparative structural and optical properties of Ge₂Sb ₂Te₅, In_0.3Ge₂Sb₂Te ₅ and Se₂Sb₂Te₆ thin films

Abstract

Keywords

ASJC Scopus subject areas

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