Hasan, Md RezaulXie, TingBarron, Sara C.Liu, GuannanNguyen, Nhan V.Motayed, AbhishekRao, Mulpuri V.Debnath, RatanFunding for Open Access provided by the UMD Libraries Open Access Publishing Fund.A self-powered ultraviolet (UV) photodetector (PD) based on p-NiO and n-ZnO was fabricated using low-temperature sputtering technique on indium doped tin oxide (ITO) coated plastic polyethylene terephthalate (PET) substrates. The p-n heterojunction showed very fast temporal photoresponse with excellent quantum efficiency of over 63% under UV illumination at an applied reverse bias of 1.2 V. The engineered ultrathin Ti/Au top metal contacts and UV transparent PET/ITO substrates allowed the PDs to be illuminated through either frontside or backside. Morphology, structural, chemical, and optical properties of sputtered NiO and ZnO films were also investigated.en-USArticle