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This letter reports the fabrication of a ZnO nanowire (NW) ultraviolet (UV) metal–semiconductor photodetector (MS-PD) integrated with a GaInP/GaAs/Ge triple-junction (TJ) solar cell. The ZnO NW MS-PD can detect UV light . The TJ solar cell transforms solar light to electrical power and provides a bias of 2.5 V to enhance the response of the detector. At this bias, the UV-to-visible...