Chemical bath deposition of cadmium sulfide thin films; In situ growth and structural studies by combined quartz crystal microbalance and electrochemical impedance techniques
- Lab. d'Electrochimie Analytique et Applique, Unite Associee au CNRS, Ecole Nationale Superieure de Chimie Paris, 75231 Paris Cedex 05 (FR)
Chemical bath deposition of CdS layers, using the ammonia process, have been studied for the first time by combined in situ quartz crystal microbalance and electrochemical impedance techniques. Both allow monitoring of the growth kinetics, but an important result is that information about the covering properties of the film, its internal structure, and the evolution of the structure during the growth, have been obtained from combined experiments. The film is shown to have in general a duplex structure with an inner compact layer (only measured by capacitance) and an outer porous layer, growing at longer reaction times. In this paper the influence of the thiourea concentration on this structure is studies and discusses. Thiourea in excess is found to be very favorable for obtaining total coverage of the substrate with a minimum thickness of the CdS film ({approx}30 nm on unactivated gold substrate), which is important for applications. A simple columnar growth model has been derived which accounts well for the experimental results.
- OSTI ID:
- 7177166
- Journal Information:
- Journal of the Electrochemical Society; (United States), Vol. 139:7; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CADMIUM SULFIDES
CRYSTAL GROWTH
AMMONIA
CHEMICAL REACTIONS
CONCENTRATION RATIO
ELECTROCHEMISTRY
IN-SITU PROCESSING
MATHEMATICAL MODELS
MICROBALANCES
MONITORING
QUARTZ
THIN FILMS
THIOUREA
ANTITHYROID DRUGS
BALANCES
CADMIUM COMPOUNDS
CARBONIC ACID DERIVATIVES
CHALCOGENIDES
CHEMISTRY
DRUGS
FILMS
HORMONE ANTAGONISTS
HYDRIDES
HYDROGEN COMPOUNDS
INORGANIC PHOSPHORS
MEASURING INSTRUMENTS
MINERALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDE MINERALS
PHOSPHORS
PROCESSING
SULFIDES
SULFUR COMPOUNDS
THIOUREAS
WEIGHT INDICATORS
360601* - Other Materials- Preparation & Manufacture
360602 - Other Materials- Structure & Phase Studies