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Deposition Of Znte Thin Films By Close Spaced Sublimation: Structural And Electrical Studies

Published online by Cambridge University Press:  10 February 2011

D. J. Goyal ,
P. G. Bilurkar ,
S. K. Thorat  and
N. V. Mate
D. J. Goyal
Affiliation:
EcoSolar Systems (India) Ltd., 117 / A / 2 Pune-Sinhgad Road, Parvati, Pune 411 030, India, ecosolar@ecosolar.com
P. G. Bilurkar
Affiliation:
EcoSolar Systems (India) Ltd., 117 / A / 2 Pune-Sinhgad Road, Parvati, Pune 411 030, India, ecosolar@ecosolar.com
S. K. Thorat
Affiliation:
EcoSolar Systems (India) Ltd., 117 / A / 2 Pune-Sinhgad Road, Parvati, Pune 411 030, India, ecosolar@ecosolar.com
N. V. Mate
Affiliation:
EcoSolar Systems (India) Ltd., 117 / A / 2 Pune-Sinhgad Road, Parvati, Pune 411 030, India, ecosolar@ecosolar.com
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Abstract

Zinc telluride has the potential of being a low-cost, environmentally stable, lowresistance and easily manufacturable back contact for CdS/CdTe solar cells. Close Spaced Sublimation (CSS) technique is used to deposit thin films of ZnTe. The results are reported in this study.

The effects of substrate temperature and film thickness on the structural properties of the deposited thin films are studied. X-ray diffractograms show that all the films prominently exhibit presence of (111) and (200) orientations. However, the degree of the preferred orientation changes as a function of the film thickness. Increase in film thickness reduces the preferential orientation.

The as deposited ZnTe thin films, being that of p-type semiconductor, are highly resistive. In order to effectively use these as contact to CdS/CdTe solar cells, they are made more conductive by doping copper. The doping is effected by dipping the films in alcoholic solution of copper chloride, followed by air annealing at 200°C. The resistivity of all the doped films drops drastically in the initial 10 minutes of annealing. The extent of doping is controlled by varying the dipping time.

The effects of substrate temperature, film thickness and doping, on the stoichiometry of the films, are studied using Atomic Absorption Spectroscopy (AAS).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 485: Symposium G – Thin Film Structures for Photovoltaics , 1997 , 261
Copyright
Copyright © Materials Research Society 1998

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