Structural and optical properties Investigation of ZnxCd1-xS thin films

CdZnXS1-X thin films with different composition have been deposited on glass substrate by by the spray pyrolysis method at RT using CdCl2 (0.1M),ZnCl2(0.1M)and H2NCSNH2(0.1M)solution and a substrate temperature of ( 400±20°C). X-ray diffraction studies reveal that the films are polycrystalline in nature with hexagonal structure and preferential orientation along (002) . The grain size of the films is found to increase form  (37.397 to 46.902) nm with increasing Zinc concentration while the strain and the dislocation density of the films are found to decrease from (7.15 to 4.54) 10 4 rad and from (3.82 to 1.93) 10 14 lines.m-2 respectively . The  transmittance  spectrums  of  CdZnxS1-x  thin  films  reveal very pronounced interference effects for photon energies below the fundamental absorption edge by exhibiting interference pattern . The optical energy gap for CdZnxS1-x thin films increases and shifts towards the UV region  as the  Zn concentration in the films increased .Â

Effect Of Thickness On Structural And Optical Properties Of ZnxCd1-xS Thin Films Prepared By Chemical Spray Pyrolysis

Zn0.5Cd0.5S polycrystalline thin films of different thickness were deposited on cleaned glass substrates by spray pyrolysis technique. X-ray diffraction was used to characterize the thin films. X-ray diffraction study showed that, all the films have the hexagonal, wurtzite structure. Grain sizes calculated from Scherer relation are in the range of 47.02-48.21 nm and the grain size of the thin films are observed to increase with the increase in the thickness of the sample. The optical properties of the polycrystalline thin films were investigated by the UV- spectroscopy. The band gap of the thin films is found to be direct allowed transition and decreases with the increase of thickness of films in the range of 2.85- 2.7 eV. Extinction coefficient k showed oscillatory behavior in lower band edge region. The Zn0.5Cd0.5S polycrystalline thin films are suitable for solar cell application