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Proceedings Paper

Chemical bath deposition of photosensitive CdS and CdSe thin films and their conversion to n-type for solar cell applications
Author(s): Santhamma M.T. Nair; Padmanabhan Karunakara Nair; R. A. Zingaro; E. A. Meyers
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Paper Abstract

Methods for preparing good quality CdS and CdSe thin films of 0.1 - 0.7 micrometer thickness from solutions at 24 - 50 degree(s)C containing citratocadmium(II) ions and thiourea (for CdS) or N, N-dimethyl selenourea (for CdSe) are presented. The as prepared CdS thin films are photosensitive showing photo- to dark-conductivity ratio (S) of > 106 under AM-2 illumination. Annealing of these films at 400 - 450 degree(s)C for a few minutes converts them to n-type through partial conversion of the films to nonstoichiometric CdO. In the case of CdSe, such annealing improves the photosensitivity of the films from S equals 10 (as prepared) to greater than 107 (after annealing) under AM-2 illumination. Either film can be converted to n-type with dark conductivities of greater than 1 (Omega) -1 cm-1 and S equals 1 to 10 under AM-2 illumination using a post deposition treatment in dilute (0.01 - 0.05 M) HgCl2 solution followed by heating at 200 degree(s)C.

Paper Details

Date Published: 23 August 1995
PDF: 11 pages
Proc. SPIE 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV, (23 August 1995); doi: 10.1117/12.217350
Show Author Affiliations
Santhamma M.T. Nair, Univ. Nacional Autonoma de Mexico (Mexico)
Padmanabhan Karunakara Nair, Univ. Nacional Autonoma de Mexico (Mexico)
R. A. Zingaro, Texas Agricultural and Mechanical Univ. (United States)
E. A. Meyers, Texas Agricultural and Mechanical Univ. (United States)


Published in SPIE Proceedings Vol. 2531:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV
Carl M. Lampert; Satyen K. Deb; Claes-Goeran Granqvist, Editor(s)

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