Chemical bath deposition of photosensitive CdS and CdSe thin films and their conversion to n-type for solar cell applications

Santhamma M.T. Nair; Padmanabhan Karunakara Nair; R. A. Zingaro; E. A. Meyers

doi:10.1117/12.217350

23 August 1995 Chemical bath deposition of photosensitive CdS and CdSe thin films and their conversion to n-type for solar cell applications

Santhamma M.T. Nair, Padmanabhan Karunakara Nair, R. A. Zingaro, E. A. Meyers

Author Affiliations +

Proceedings Volume 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV; (1995) https://doi.org/10.1117/12.217350
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

Citation Download Citation

Santhamma M.T. Nair, Padmanabhan Karunakara Nair, R. A. Zingaro, and E. A. Meyers "Chemical bath deposition of photosensitive CdS and CdSe thin films and their conversion to n-type for solar cell applications", Proc. SPIE 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV, (23 August 1995); https://doi.org/10.1117/12.217350

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