Chemical bath deposition of photosensitive CdS and CdSe thin films and their conversion to n-type for solar cell applications
- Univ. Nacional Autonoma de Mexico, Morelos (Mexico). Lab. de Energia Solar
- Texas A and M Univ., College Station, TX (United States). Dept. of Chemistry
Methods for preparing good quality CdS and CdSe thin films of 0.1--0.7 {micro}m thickness from solutions at 24--50 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 > 10{sup 6} under AM-2 illumination. Annealing of these films at 400--450 C for a few minutes converts them to n-type through partial conversion of the films to non stoichiometric CdO. In the case of CdSe, such annealing improves the photosensitivity of the films from S = 10 (as prepared) to > 10{sup 7} (after annealing) under AM-2 illumination. Either film can be converted to n-type with dark conductivities of > 1 {Omega}{sup {minus}1} cm{sup {minus}1} and S = 1 to 10 under AM-2 illumination using a post deposition treatment in dilute (0.01--0.05 M) HgCl{sub 2} solution followed by heating at 200 C.
- OSTI ID:
- 197626
- Report Number(s):
- CONF-950793-; ISBN 0-8194-1890-0; TRN: IM9612%%400
- Resource Relation:
- Conference: 40. annual meeting of the Society of Photo-Optical Instrumentation Engineers, San Diego, CA (United States), 9-14 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Optical materials technology for energy efficiency and solar energy conversion XIV; Lampert, C.M. [ed.] [Lawrence Berkeley Lab., CA (United States). Energy and Environment Div.]; Deb, S.K. [ed.] [National Renewable Energy Lab., Golden, CO (United States)]; Grandqvist, C.G. [ed.] [Uppsala Univ. (Sweden). Dept. of Technology]; PB: 379 p.; Proceedings/SPIE, Volume 2531
- Country of Publication:
- United States
- Language:
- English
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