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 ۲۰.۵  and ۲.۲۲ at bias voltage of ۵ V, respectively.  Under bias voltage of ۵ V, the responsivity of the UV photodetector was. The calculated photosensitivity of the UV photodetector was ۱۰۷.۴ at bias voltage of ۵ V. The fast response time (۱۹۱ ms) and recovery time (۲۶۱ ms) of the fabricated UV photodetectors were achieved in UV turn-on/off switching measurements.     

Keywords:

Chemical Bath Deposition , Crystal Structure , Cu-doped ZnO nanorods , Polyethylene terephthalate , UV photodetector