40.
Herein, we report the photosensing property of Cd
S thin films. Cd
S thin films were coated onto glass substrates via a spray pyrolysis method using different spray pressures. Prepared films were characterized using X-ray diffraction (XRD), scanning electron microscopy (
SEM), and optical and photoluminescence spectroscopy. XRD analysis demonstrated the growth of crystalline Cd
S films with crystallite sizes varying from 26 to 29 nm depending on the pressure. The
SEM and EDAX analyses revealed nearly-stoichiometric Cd
S films with smooth surfaces and slight variation in grain morphology due to pressure changes. Optical measurements showed a direct bandgap varying from 2.37 eV to 2.42 eV due to pressure changes. A photodetector was also fabricated using the grown Cd
S films; the fabricated photodetector exhibited good performance depending on the spray pressure. A spray pressure of 1.5 GPa resulted in high photoresponsivity and external quantum efficiency.
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