Cubic to hexagonal phase transition in CdTe polycrystalline thin films by oxygen incorporation

H. Arizpe-Chávez, F. J. Espinoza-Beltrán, R. Ramírez-Bon, O. Zelaya-Angel, J. González-Hernández

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27 Scopus citations

Abstract

Polycrystalline oxygenated cadmium telluride thin films, with oxygen contents ranging from 0 to 15 at %, were grown by the reactive radio frequency sputtering technique. The structure of samples was studied using X-ray diffraction. The energy band gaps of the samples were obtained from optical absorption measurements. It was found that the cubic crystalline structure of as-deposited samples changes to the crystalline hexagonal CdTe phase and then to an amorphous CdTe:O structure as the oxygen content was increased from 0 to 15 at %. Evidence of this phase transition was obtained from X-ray diffraction and optical absorption measurements. For the films with low oxygen content an increase in the interplanar distances was observed, yielding to a reduction of the band gap of the material. Samples containing hexagonal CdTe nanocrystals show larger energy band gaps, as compared with those having the cubic CdTe phase. Copyright © 1996 Published by Elsevier Science Ltd.
Original languageAmerican English
Pages (from-to)39-43
Number of pages5
JournalSolid State Communications
DOIs
StatePublished - 1 Jan 1997

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