Electrochemical deposition and characterisation of CdTe thin films from an ethylene-glycol-based bath
✍ Scribed by A. Carlos; P. J. Sebastian; O. Solorza; S. A. Gamboa
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 614 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1616-301X
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✦ Synopsis
CdTe films were deposited on Ni and conducting glass (SnO 2 ) substrates from an ethyleneglycol-based bath by galvanostatic and potentiostatic methods. The film composition and electrical properties depend on parameters such as working electrode potential current density, deposition temperature, substrate type and post-deposition treatments. It is possible to improve the grain size and stoichiometry of the film by post-deposition heat treatment in air. The conductivity type was determined from the photocurrent-working electrode potential behaviour of the film. Dark capacitance measurements in a 0.5 M H 2 SO 4 solution at 10 kHz showed a linear behaviour, from which the flatband potential V fb = -0.365 V vs. a saturated calomel electrode (SCE) and the doping density N D = 1.35 × 10 18 cm -3 were determined.