Study of the Effect of Incorporation of CdS Nanoparticles on the Porous Silicon Photodetector

In this study, the influence of embedding cadmium sulfide nanoparticles, synthesised by a chemical method, on the performance of porous silicon matrix photodetectors was investigated. An anodization technique was used to fabricate porous silicon photodetectors at 16 mA/cm(2) for 10 min.The characteristics of porous silicon and CdS nanoparticles were investigated by using x-ray diffraction XRD, atomic force microscopy AFM, scanning electron microscopy SEM, and energy dispersive x-ray EDX. Dark and illuminated current-voltage I-V characteristics and spectral responsivity of photodetectors were investigated before and after the incorporation of CdS nanoparticles. Considerable improvement was noticed in responsivity of the porous silicon photodetector after incorporating the CdS nanoparticles into the silicon matrix.