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 °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 × 1013 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.