Journal
NANOMATERIALS
Volume 10, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/nano10061225
Keywords
UV detector; codoping in ZnO; ZnO nanorods; plastic substrate; spectral responsivity
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Funding
- Mid-career Researcher Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2019R1A2C2086747]
- Nano-material Technology Development Program through the NRF - Ministry of Science, ICT and Future Planning [K200304003]
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A growth scheme at a low processing temperature for high crystalline-quality of ZnO nanostructures can be a prime stepping stone for the future of various optoelectronic devices manufactured on transparent plastic substrates. In this study, ZnO nanorods (NRs) grown by the hydrothermal method at 150 degrees C through doping of transition metals (TMs), such as Co, Ni, or Co-plus-Ni, on polyethylene terephthalate substrates were investigated by various surface analysis methods. The TM dopants in ZnO NRs suppressed the density of various native defect-states as revealed by our photoluminescence and X-ray photoelectron spectroscopy analysis. Further investigation also showed the doping into ZnO NRs brought about a clear improvement in carrier mobility from 0.81 to 3.95 cm(2)/V-s as well as significant recovery in stoichiometric contents of oxygen. Ultra-violet photodetectors fabricated with Co-plus-Ni codoped NRs grown on an interdigitated electrode structure exhibited a high spectral response of similar to 137 A/W, on/off current ratio of similar to 135, and an improvement in transient response speed with rise-up and fall-down times of similar to 2.2 and similar to 3.1 s, respectively.
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