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New buffer layers, large band gap ternary compounds: CuAlTe2

Published online by Cambridge University Press:  15 April 2000

K. Benchouk ,
E. Benseddik ,
C. O. El Moctar ,
J. C. Bernède ,
S. Marsillac ,
J. Pouzet  and
A. Khellil
K. Benchouk
Affiliation:
Université d'Oran, Laboratoire de Physique des Matériaux et Composants pour l'Électronique, B.P. 1524, El Mnaouer Oran, Algeria
E. Benseddik
Affiliation:
Université de Cadi Ayyad, Faculté des Sciences et Technique, B.P. 618, Guéliz, Marrakech, Morocco
C. O. El Moctar
Affiliation:
Université de Nantes, Équipe de Physique des Solides pour l'Électronique, Groupe couche minces et Matériaux nouveaux, FSTN, 2 rue de la Houssinière, B.P. 92208, 44322 Nantes Cedex 03, France
J. C. Bernède*
Affiliation:
Université de Nantes, Équipe de Physique des Solides pour l'Électronique, Groupe couche minces et Matériaux nouveaux, FSTN, 2 rue de la Houssinière, B.P. 92208, 44322 Nantes Cedex 03, France
S. Marsillac
Affiliation:
Université de Nantes, Équipe de Physique des Solides pour l'Électronique, Groupe couche minces et Matériaux nouveaux, FSTN, 2 rue de la Houssinière, B.P. 92208, 44322 Nantes Cedex 03, France
J. Pouzet
Affiliation:
Université de Nantes, Équipe de Physique des Solides pour l'Électronique, Groupe couche minces et Matériaux nouveaux, FSTN, 2 rue de la Houssinière, B.P. 92208, 44322 Nantes Cedex 03, France
A. Khellil
Affiliation:
Université d'Oran, Laboratoire de Physique des Matériaux et Composants pour l'Électronique, B.P. 1524, El Mnaouer Oran, Algeria
*
jean-christian.bernede@physique.univ-nantes.fr
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Abstract

After deposition, by evaporation under vacuum, of Al/Cu/Te. multilayer structures, annealing at 673 K or more for half an hour, under argon flow, allows CuAlTe2 films crystallised in the chalcopyrite structure to be obtained. The optical and electrical properties are interpreted by introducing the influence of impurity foreign phases present in the films. The optical properties are sensitive to the small Al2O3 domains randomly distributed into the CuAlTe2 polycrystalline matrix. The optical band gap is slightly increased (2.35 eV) by the presence of alumina. The conductivity measurements show that a short circuit effect can be induced by a binary Cu $_{2-x}$ Te degenerate phase present at the surface of the films. This effect can be suppressed by KCN etching of the samples that allows the superficial foreign phase to be dissolved.

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Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 10 , Issue 1 , April 2000 , pp. 9 - 14
Copyright
© EDP Sciences, 2000

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