Abstract
In this investigation, CdS nanoparticles were prepared for utilisation in the CdS-based photodetector device. X-ray diffraction (XRD), Scanning electron microscopy (SEM), Ultraviolet–visible (UV–vis) absorption spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and Dynamic light scattering (DLS) were used to analyse the properties of CdS nanoparticles. By using the standard Scherrer formula, the crystallite size was found to be 11.5 nm and Tauc plot gave the optical band gap energy of 3.13 eV. The dynamic light scattering experiment suggests that most of the particles are distributed in the range of 1–150 nm. Excellent photodetection parameters were observed during the photodetection experiments. The observed photoresponsivity was found to 35.78 mA/W with the detectivity of 2.23 × 1010 Jones. This photodetector device also shows the external quantum efficiency of 12.13 % with a noise equivalent power of 8.97 × 10-6 W.
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