Tóm tắt

Thin films of Cd1-xZnxS (CZS) nanostructures were prepared by chemical spray pyrolysis technique with differentrnZn-doping levels (Cd1-xZnxS) in ‘x’ ratios of 0.00, 0.01, 0.03, 0.05 and 0.1 for 0%, 1%, 3%, 5% and 10 wt% of Znrnrespectively on heated glass substrates at 350 ◦C. The effect of the Zn dopant on surface morphology and itsrneffect on nonlinear optical (NLO) properties were investigated using atomic force microscopy (AFM) and Z-scanrntechnique by Diode Pumped Solid State (DPSS) continuous-wave laser at 532 nm respectively. The surfacernroughness was found to be decreased with the increased Zn-doping on CdS. A significant red shift in the bandrnedge and an increase in the transmittance of the films in the visible and NIR regions were also observed. Thernenergy gap (Eg) of the prepared films was estimated and found to be enhanced by 3% i.e. in the range from 2.48rnto 2.60 eV. The determined third-order NLO components such as nonlinear absorption coefficient (β), nonlinearrnrefractive index (n2) and the susceptibility χ(3) were found to be in the range from 2.52 × 10− 3 to 7.25 × 10− 3rn(cmW− 1), 2.01 × 10− 8 to 3.92 × 10− 8 (cm2 W− 1) and 1.30 × 10− 6 to 2.67 × 10− 6 (esu) respectively. The resultsrnindicate that NLO properties and photoluminescence of the prepared thin films can be tuned with surfacernmorphology. This inspiring NLO results of Cd1-xZnxS thin film is a promising and capable material for optornelectronic device applications.