Abstract
A high-performance ultraviolet photodetector has been successfully fabricated based on new CuO/CdSe core-shell nanowires (NWs). The obtained modulated optical band gap due to quantum confinement effect has the capability to detect photons with energies (3.96 eV) significantly larger than the band gap of CuO (1.2 eV) and CdSe (1.7 eV), which is mainly attributed to the abrupt interface between the CuO core and CdSe shell. The fabricated CuO/CdSe core-shell heterostructure NWs as photodetector device showed responsivity 0.63A/W with external quantum efficiency approximately 3.14 × 102% under illumination of wavelength 254 nm. The strong response of CuO/CdSe NWs photodetector is explained by the Type-II band alignment which cause the separation of photo generated electron–hole pairs and their charge transfer at the junction.
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