Graded composition Cd<inf>x</inf>Zn<inf>1-x</inf>Te films grown by Isothermal Close Space Sublimation technique

O. De Melo, A. Domínguez, K. Gutiérrez Z-B, G. Contreras-Puente, S. Gallardo-Hernández, A. Escobosa, J. C. González, R. Paniago, J. Ferraz Dias, M. Behar

Research output: Contribution to journalArticle

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Abstract

© 2015 Elsevier B.V. All rights reserved. Graded composition CdxZn1-xTe films were prepared by growing several alternate layers of CdTe and ZnTe by the Isothermal Close Space Sublimation technique. The thickness of both kinds of layers was modified along the structure to produce an increase of the average concentration of CdTe towards the surface of the films. Due to Zn/Cd inter-diffusion during the growth process the sequence of layers was converted into a relatively smooth graded composition film. According to X-ray diffraction characterization the layers grew coherently with the (100) oriented GaAs substrates although they showed a relatively high mosaicity. θ-2θ plots show very wide diffraction peaks as expected from variable composition samples. The band gap grading effect in light absorption was also verified through transmission measurements, using transparent substrates. Graded composition profiles of the thin films were confirmed by x-ray photoelectron and secondary ion mass spectroscopies. Moreover, quantitative Cd, Zn and Te profiles were obtained by the analysis of Rutherford backscattering spectra of the samples. This analysis showed a CdTe molar fraction profile ranging from approximately x=0.8 at the surface of the sample and x=0.35 at the interface with the substrate. The possibility of growing graded composition layers using a simple and cost-effective procedure was demonstrated. This could be interesting in technological applications like CdxZn1-xTe layers of variable composition in CdS/CdTe solar cells.
Original languageAmerican English
Pages (from-to)17-21
Number of pages14
JournalSolar Energy Materials and Solar Cells
DOIs
StatePublished - 1 Jan 2015

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Secondary Ion Mass Spectrometry
Sublimation
X-Ray Diffraction
X-Rays
Costs and Cost Analysis
Growth
Chemical analysis
Substrates
Rutherford backscattering spectroscopy
Photoelectrons
Light absorption
CdZnTe
gallium arsenide
Solar cells
Energy gap
Diffraction
Spectroscopy
Ions
X ray diffraction
X rays

Cite this

De Melo, O. ; Domínguez, A. ; Gutiérrez Z-B, K. ; Contreras-Puente, G. ; Gallardo-Hernández, S. ; Escobosa, A. ; González, J. C. ; Paniago, R. ; Ferraz Dias, J. ; Behar, M. / Graded composition Cd<inf>x</inf>Zn<inf>1-x</inf>Te films grown by Isothermal Close Space Sublimation technique. In: Solar Energy Materials and Solar Cells. 2015 ; pp. 17-21.
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abstract = "{\circledC} 2015 Elsevier B.V. All rights reserved. Graded composition CdxZn1-xTe films were prepared by growing several alternate layers of CdTe and ZnTe by the Isothermal Close Space Sublimation technique. The thickness of both kinds of layers was modified along the structure to produce an increase of the average concentration of CdTe towards the surface of the films. Due to Zn/Cd inter-diffusion during the growth process the sequence of layers was converted into a relatively smooth graded composition film. According to X-ray diffraction characterization the layers grew coherently with the (100) oriented GaAs substrates although they showed a relatively high mosaicity. θ-2θ plots show very wide diffraction peaks as expected from variable composition samples. The band gap grading effect in light absorption was also verified through transmission measurements, using transparent substrates. Graded composition profiles of the thin films were confirmed by x-ray photoelectron and secondary ion mass spectroscopies. Moreover, quantitative Cd, Zn and Te profiles were obtained by the analysis of Rutherford backscattering spectra of the samples. This analysis showed a CdTe molar fraction profile ranging from approximately x=0.8 at the surface of the sample and x=0.35 at the interface with the substrate. The possibility of growing graded composition layers using a simple and cost-effective procedure was demonstrated. This could be interesting in technological applications like CdxZn1-xTe layers of variable composition in CdS/CdTe solar cells.",
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De Melo, O, Domínguez, A, Gutiérrez Z-B, K, Contreras-Puente, G, Gallardo-Hernández, S, Escobosa, A, González, JC, Paniago, R, Ferraz Dias, J & Behar, M 2015, 'Graded composition Cd<inf>x</inf>Zn<inf>1-x</inf>Te films grown by Isothermal Close Space Sublimation technique', Solar Energy Materials and Solar Cells, pp. 17-21. https://doi.org/10.1016/j.solmat.2015.02.025

Graded composition Cd<inf>x</inf>Zn<inf>1-x</inf>Te films grown by Isothermal Close Space Sublimation technique. / De Melo, O.; Domínguez, A.; Gutiérrez Z-B, K.; Contreras-Puente, G.; Gallardo-Hernández, S.; Escobosa, A.; González, J. C.; Paniago, R.; Ferraz Dias, J.; Behar, M.

In: Solar Energy Materials and Solar Cells, 01.01.2015, p. 17-21.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Graded composition CdxZn1-xTe films grown by Isothermal Close Space Sublimation technique

AU - De Melo, O.

AU - Domínguez, A.

AU - Gutiérrez Z-B, K.

AU - Contreras-Puente, G.

AU - Gallardo-Hernández, S.

AU - Escobosa, A.

AU - González, J. C.

AU - Paniago, R.

AU - Ferraz Dias, J.

AU - Behar, M.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - © 2015 Elsevier B.V. All rights reserved. Graded composition CdxZn1-xTe films were prepared by growing several alternate layers of CdTe and ZnTe by the Isothermal Close Space Sublimation technique. The thickness of both kinds of layers was modified along the structure to produce an increase of the average concentration of CdTe towards the surface of the films. Due to Zn/Cd inter-diffusion during the growth process the sequence of layers was converted into a relatively smooth graded composition film. According to X-ray diffraction characterization the layers grew coherently with the (100) oriented GaAs substrates although they showed a relatively high mosaicity. θ-2θ plots show very wide diffraction peaks as expected from variable composition samples. The band gap grading effect in light absorption was also verified through transmission measurements, using transparent substrates. Graded composition profiles of the thin films were confirmed by x-ray photoelectron and secondary ion mass spectroscopies. Moreover, quantitative Cd, Zn and Te profiles were obtained by the analysis of Rutherford backscattering spectra of the samples. This analysis showed a CdTe molar fraction profile ranging from approximately x=0.8 at the surface of the sample and x=0.35 at the interface with the substrate. The possibility of growing graded composition layers using a simple and cost-effective procedure was demonstrated. This could be interesting in technological applications like CdxZn1-xTe layers of variable composition in CdS/CdTe solar cells.

AB - © 2015 Elsevier B.V. All rights reserved. Graded composition CdxZn1-xTe films were prepared by growing several alternate layers of CdTe and ZnTe by the Isothermal Close Space Sublimation technique. The thickness of both kinds of layers was modified along the structure to produce an increase of the average concentration of CdTe towards the surface of the films. Due to Zn/Cd inter-diffusion during the growth process the sequence of layers was converted into a relatively smooth graded composition film. According to X-ray diffraction characterization the layers grew coherently with the (100) oriented GaAs substrates although they showed a relatively high mosaicity. θ-2θ plots show very wide diffraction peaks as expected from variable composition samples. The band gap grading effect in light absorption was also verified through transmission measurements, using transparent substrates. Graded composition profiles of the thin films were confirmed by x-ray photoelectron and secondary ion mass spectroscopies. Moreover, quantitative Cd, Zn and Te profiles were obtained by the analysis of Rutherford backscattering spectra of the samples. This analysis showed a CdTe molar fraction profile ranging from approximately x=0.8 at the surface of the sample and x=0.35 at the interface with the substrate. The possibility of growing graded composition layers using a simple and cost-effective procedure was demonstrated. This could be interesting in technological applications like CdxZn1-xTe layers of variable composition in CdS/CdTe solar cells.

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