Metal oxide nanostructure based ultraviolet photodetectors for smart lighting applications

Sharma, Prachi
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Sawyer, Shayla Maya Louise
Shur, Michael
Bhat, Ishwara B.
Plawsky, Joel L., 1957-
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Electrical engineering
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Performance enhancement of the photodetectors is achieved by using functionalized multi-walled carbon nanotubes for better charge carrier collection efficiency and faster charge transport. The impact of the thickness of carbon nanotube network on the dark and photo current of the photodetectors is studied. Surface passivation using two polymers: PVA and PVP, is proposed to suppress the parasitic luminescence caused by defects in the metal oxides. Surface passivation is shown to improve the responsivity of the photodetector by a factor of hundred. The polymer properties that dictate the performance enhancement of photodetectors are evaluat-ed. Hollow nanospherical structures are explored to further improve the responsivity. Template free synthesis method for tin oxide hollow nanospheres using Ostwald ripening process is pre-sented. The responsivity of the photodetector fabricated with tin oxide hollow nanospheres shows nine hundred times improvement compared to the nanoparticle-based detector. Whisper-ing gallery mode resonance phenomenon is discussed to explain high responsivity of photodetec-tors fabricated using hollow nanospheres.
May 2018
School of Engineering
Dept. of Electrical, Computer, and Systems Engineering
Rensselaer Polytechnic Institute, Troy, NY
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