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• W2068388213 abstract "ZnO bulk material (bandgap 3.26 eV) was reduced in size via a top-down wet-chemistry synthesis process into colloidal nanoparticles that were then coated with polyvinyl-alcohol (PVA). When the nanoparticles were excited at 340 nm, strong UV emission at 377 nm was observed, and parasitic green emission (510 nm) which normally appears in ZnO nano-material was suppressed. Quantum confinement effects of the nanoparticles were observed by a 5 nm blue shift from ZnO bulk material (380 nm) in the absorption spectrum. The same characteristics held true when the particles were deposited onto substrates to form a photoconductive detector. Point contact current-voltage characteristics of the detector were measured under darkness and 340 nm UV LED. The ratio of the UV photogenerated current to dark current was as high as 105. Spectral response of the detector demonstrates a sharp cut-off wavelength at 375 nm, with a UV responsivity equivalent to twice that of a commercial UV enhanced Si-based photodetector. The time response indicated the rise and fall time were 22s and 11s respectively. The results confirm that top-down wet-chemistry synthesized ZnO nanoparticles are suitable for small signal visible blind UV detection." @default.
• W2068388213 created "2016-06-24" @default.
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• W2068388213 date "2010-06-01" @default.
• W2068388213 modified "2023-09-26" @default.
• W2068388213 title "Ultraviolet Photodetection Based on ZnO Colloidal Nanoparticles Made by Top-Down Wet-Chemistry Synthesis Process" @default.
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• W2068388213 doi "https://doi.org/10.1109/sopo.2010.5504360" @default.
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