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Title: Effect of ambient H2S atmosphere on the optical, structural and electrical properties of vacuum deposited thin films of cadmium sulphide
Authors: Singh, Virendra
Singh, Beer Pal
Lal, Kasturi
Tyagi, R C
Sharma, T P
Issue Date: Apr-2002
Publisher: NISCAIR-CSIR, India
Abstract: Evaporated thin films of cadmium sulphide have been deposited in a low ambient atmosphere of H2S (~10-4 torr). The H2S atmosphere was obtained by controlled thermal decomposition of thiourea inside the vacuum chamber. Keeping the substrates at an elevated temperature of about 200°C helps eject any sulphur atoms deposited due to thermal decomposition of CdS during evaporation. The cadmium ions promptly recombined with the H2S to give better stoichiometry of the deposited films. The films grown by this technique have better uniformity and have better crystallinity. Apart from being more adherent to the substrates, such films are pin-holes free, which is a very vital factor in any device fabrication. The technique is applicable for all sulphide films including ZnS, PbS, CuS. Optical, electrical conductivity, X-ray diffraction and scanning electron microscope patterns are presented to show the better quality of the sulphide films deposited by this technique.
Page(s): 153-155
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.09(2) [April 2002]

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