fast uv detection by cu-doped zno nanorod arrays chemically deposited on pet substrate

Well-aligned cu-doped zno nanorods were successfully synthesized on polyethylene terephthalate (pet) substrate using chemical bath deposition method. the structural and optical properties of cu-doped zno nanorods were investigated using x-ray diffraction (xrd), field-emission scanning electron microscopy (fesem), energy dispersive x-ray spectroscopy (edx) and photoluminescence (pl) spectroscopy. a metal- semiconductor-metal (msm) uv photodetector was successfully fabricated using high-quality cu-doped zno nanorods. the dark current and photocurrent of the msm photodetector based on cu doped zno nanorods were 20.5 μa and 2.22 ma at bias voltage of 5 v, respectively. under bias voltage of 5 v, the responsivity of the uv photodetector was 3.69 a/w. the calculated photosensitivity of the uv photodetector was 107.4 at bias voltage of 5 v. the fast response time (191 ms) and recovery time (261 ms) of the fabricated uv photodetectors were achieved in uv turn-on/off switching measurements.