Photo-responsive analysis of branchy dendrites-like CuO/PS p-n junction visible light photodetector

A series of p-CuO/n-PS heterojunction self -powered visible light photodetector was fabricated as a function CuO nanostructure deposition time through electrochemical process. Herein, X-ray diffraction confirmed formation of crystalline layers, while field emission scanning electron microscopy evidenced the occurrence nano -sized branchy dendrites -like morphology; the fabricated layers exhibited optical bandgap value of 2.07 Simultaneously, the fabricated devices demonstrated a well -oriented figure of merits as a function of wavelength and illumination power at extremely low bias voltage (0.5 V). In detail, responsivity of 59 mu A/W as well detectivity of 23 x1019 Jones were obtained, respectively, for the optimum device at 635 nm; an external quantum efficiency of 115.2 at 100 mW/cm2 was attained whereas such an observation was found to be deteriorated at lower/higher wavelengths. The pronounced device exhibited response/recovery time of 0.33 and 0.83 sec. at zero bias voltage evidencing a self -powered feature of the proposed system.