Browsing by Author "Hasan, Md Rezaul"
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Item Metal Oxide, Group V-VI Chalcogenides and GaN/AlGaN Photodetectors(2016) Hasan, Md Rezaul; Hasan, Md Rezaul; Mulpuri, RaoStructural, electrical and optical properties of metal oxide and Group V-VI chalcogenide based semiconductor materials and their optoelectronic response were studied when used as UV-Visible-NIR photodetectors. Optimization of processing steps was done to achieve better quality films in terms of crystallinity and stoichiometry.The films were thoroughly characterized for their structural, electrical and optical behavior. For visible blind- UV detection, transparent metal oxide (TMO) based photodiodes were fabricated and for UV-NIR broadband detection of wavelength, Group V-VI chalcogenide nanostructure photodiodes were fabricated.Item Self-powered p-NiO/n-ZnO heterojunction ultraviolet photodetectors fabricated on plastic substrates(American Institute of Physics, 2015-10-01) Hasan, Md Rezaul; Xie, Ting; Barron, Sara C.; Liu, Guannan; Nguyen, Nhan V.; Motayed, Abhishek; Rao, Mulpuri V.; Debnath, RatanA 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.