FIZIKA A (1998) 3,  97-106

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INFLUENCE OF HEAT TREATMENT ON THE PHYSICAL PROPERTIES OF ANTIMONY TRISULFIDE THIN FILMS

INAS K. EL ZAWAWIa, AHMED ABD ELMOEZa, FATMA S. TERRAa and MOHAMED MOUNIRb

aSolid State Physics Lab., National Research Centre, Tahrir St., Dokki, Cairo, Egypt
bPhysics Department, Faculty of Science, Cairo University, Giza, Cairo, Egypt

Received 15 December 1997;
Accepted 7 September 1998

The influence of isochronal and isothermal annealing for 0 to 180 minutes and at 27 to 250C, respectively, on the optical and electrical properties of thin films of Sb2S3 have been investigated. The films deposited on glass substrate by thermal vacuum evaporation have amorphous structure, but after annealing at temperatures above 200C for 3 hours, they change to polycrystalline structure. The optical absorption coefficient becomes higher for subgap absorption at higher annealing temperatures. The value of the optical Tauc gap and direct band gap changed with the annealing temperature. The dark electrical resistivity showed a decrease by about an order of magnitude when increasing both the isochronal and isothermal annealing treatment.

Keywords: Sb2S3 thin films vacuum evaporated, amorphous and polycrystalline, heat treatment, optical and electrical properties

 

 
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