Affect The Precipitation Times on The Prepared Nanocystals of CdS by Chemical Bath Deposition

Abstract

The nanocrystals of Cadmium sulfide (CdS) are synthesized via chemical bath technique and deposited onto glass substrates commercial plates at different time (60,120,180and 240 )minute respectively, then annealing at 300°C to enhance the adhesion and recrystallization the films. The results confirmed that the structural features the examined by X-ray diffraction(XRD) are wurtzite structures for all samples while the atomic force microscope( AFM ) examinations give prefect analyses and proved that increasing the precipitation times effect on the morphological surfaces become clear to be more homogenies and compact, the roughness increased on the surface with increasing the deposition time expect at 240 mintue decrease, therefore ; can be notice that average roughness around (1.83, 2.99,3.24 and 3.13)nm series. The absorbance spectra of the deposited CdS nanocrtysals illustrate high absorbance in visible region, on the other hand observes that the optical energies gaps increase slightly for all films with increasing the deposition times of the samples and register about (2.3, 2.4, 2.5 and 2.65) eV respectively. So note that the colors of solutions is yellow and remain temperature at (80)°C during period preparation in the bath and value of PH is 10.5 of solutions.