Nanoparticulate CdS 2D array by chemical bath deposition: Characterization and optoelectronic study

Nanostructured CdS thin film was successfully deposited on glass by chemical bath deposition (CBD) at 80 degrees C. The effect of deposition time on the morphology, composition, optical and optoelectronic properties of nanostructured CdS thin films has been studied. The CBD-grown CdS thin films showed random arrangement of interconnected nanoparticles in 2D morphology. Nanostructured CdS thin films exhibited metastable cubic phase having uniform, compact and defect-free structure with enhanced crystallinity. Tauc plot of CBD-grown nanostructured CdS thin film showed an optimum band gap of 2.30 eV and a resonant Raman peak at 302 cm(-1). The transverse optics (TO) mode, multi-phonon scattering and high-order replicas of nanostructured CdS thin films were also observed. Metal-semiconductor-metal (MSM) based CdS Photodetector (PD) showed an excellent photodetectivity of 2.6 x 10(13) Jones. Photoconductive performance such as photo-sensitivity (207%) and - responsivity (0.38 A/W @ 420 nm) under an illumination condition was obtained for application in visible-light photodetector.