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Modification of the Optical and Electrical Properties CdS Films by Annealing in Neutral and Reducing Atmospheres

Published online by Cambridge University Press:  12 September 2013

J. Pantoja Enriquez ,
G. Pérez Hernandez ,
X. Mathew ,
G. Ibáñez Duharte ,
J. Moreira ,
J. A. Reyes Nava ,
J. J. Barrionuevo ,
L. A. Hernandez ,
R. Castillo  and
P. J. Sebastian
J. Pantoja Enriquez
Affiliation:
Centro de Investigación y Desarrollo Tecnológico en Energías Renovables, Universidad de Ciencias y Artes de Chiapas, Tuxtla Gutiérrez, Chiapas, México. Universidad Politécnica de Chiapas, Tuxtla Gutiérrez, Chiapas, México.
G. Pérez Hernandez
Affiliation:
Universidad Juárez Autónoma de Tabasco. Villahermosa, Tabasco, México.
X. Mathew
Affiliation:
Centro de Investigación en Energía, UNAM, Temixco, Morelos, México.
G. Ibáñez Duharte
Affiliation:
Centro de Investigación y Desarrollo Tecnológico en Energías Renovables, Universidad de Ciencias y Artes de Chiapas, Tuxtla Gutiérrez, Chiapas, México.
J. Moreira
Affiliation:
Centro de Investigación y Desarrollo Tecnológico en Energías Renovables, Universidad de Ciencias y Artes de Chiapas, Tuxtla Gutiérrez, Chiapas, México.
J. A. Reyes Nava
Affiliation:
Centro de Investigación y Desarrollo Tecnológico en Energías Renovables, Universidad de Ciencias y Artes de Chiapas, Tuxtla Gutiérrez, Chiapas, México.
J. J. Barrionuevo
Affiliation:
Centro de Investigación y Desarrollo Tecnológico en Energías Renovables, Universidad de Ciencias y Artes de Chiapas, Tuxtla Gutiérrez, Chiapas, México.
L. A. Hernandez
Affiliation:
Centro de Investigación y Desarrollo Tecnológico en Energías Renovables, Universidad de Ciencias y Artes de Chiapas, Tuxtla Gutiérrez, Chiapas, México.
R. Castillo
Affiliation:
Universidad Politécnica de Chiapas, Tuxtla Gutiérrez, Chiapas, México.
P. J. Sebastian
Affiliation:
Centro de Investigación en Energía, UNAM, Temixco, Morelos, México.
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Abstract

Cadmium sulfide (CdS) films were deposited onto glass substrates by chemical bath deposition (CBD) from a bath containing cadmium acetate, ammonium acetate, thiourea, and ammonium hydroxide. The CdS thin films were annealed in argon (neutral atmosphere) or hydrogen (reducing atmosphere) for 1 h at various temperatures (300, 350, 400, 450 and 500 °C). The changes in optical and electrical properties of annealed treated CdS thin films were analyzed. The results showed that, the band-gap and resistivity depend on the post-deposition annealing atmosphere and temperatures. Thus, it was found that these properties of the films, were found to be affected by various processes with opposite effects, some beneficial and others unfavorable. The energy gap and resistivity for different annealing atmospheres was seen to oscillate by thermal annealing. Recrystallization, oxidation, surface passivation, sublimation and materials evaporation were found the main factors of the heat-treatment process responsible for this oscillating behavior. Annealing over 400 °C was seen to degrade the optical and electrical properties of the film.

Keywords

annealingoptical propertiesthin film
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1538: Symposium C – Compound Semiconductors: Thin-Film Photovoltaics, LEDs and Smart Energy Controls , 2013 , pp. 377 - 382
Copyright
Copyright © Materials Research Society 2013 

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