EFFECT OF THICKNESS ON THE STRUCTURAL AND OPTICAL PROPERTIES OF ZnS THIN FILMS PREPARED BY FLASH EVAPORATION TECHNIQUE EQUIPPED WITH MODIFIED FEEDER

摘要

ZnS thin layers have been deposited on glass substrate by flash evaporation technique equipped with a modified feeder. This new feeder is an additional system to flash evaporation technique which gives a better control to materials transferring into boat in thermal evaporation coating system. In the present work, using this method, ZnS thin films of 100nm, 300nm and 500nm thick were made successfully for structural and optical properties studies. The specimens were characterized using x-ray diffraction and UV-Vis spectrophotometer. The structural characterization revealed a cubic phase for all of the grown ZnS films. From analyzed optical data, it was found that the optical parameters, namely, absorbance, transmittance, band gap energy and refractive index changed upon increasing the thickness of samples.