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The visible light response of Ag-CuO-Ag metal-semiconductor-metal (MSM) photodetector is presented. Electron beam deposited CuO thin films consisted of tightly packed nanocrystallites in monoclinic phase. The observed red-shifts in indirect band-gap from 1.09 eV to 0.99 eV and direct band-gap from 2.92 eV to 2.87 eV, with annealing temperature, is attributed to the weak quantum confinement effect...
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