Lee, HanJin Jung, Hyun Kyu Kim, Young Eun Beom, Keonwon Mun, Jeong Heum Hong, A-Ra Jang, Ho Seong Park, Jong-Sung Yoon, Tae-Sik Kim, Dong Hun 2024-01-19T17:30:56Z 2024-01-19T17:30:56Z 2021-09-04 2020-06-05 0925-8388 https://pubs.kist.re.kr/handle/201004/118531 In this study, ZnO microrods were directly synthesized via a single-step solid-state reaction using ZnO powders mixed with graphite without a catalyst under an air atmosphere, instead of using vacuum systems and flowing gases. The structure, growth mechanism, and electrical and optical properties of the microrods were investigated under varying growth conditions. The high-resolution transmission electron microscopy images confirmed the formation of single-crystal ZnO microrods. The photoluminescence spectra of the microrods showed green emission, suggesting the formation of non-stoichiometric ZnO microrods due to the formation of oxygen vacancies during sintering. The length and width of the ZnO microrods could be modulated by controlling the graphite content, sintering temperature, and residual time. A simple photodetector consisting of a single-crystal ZnO microrod on a SiO2 -coated Si substrate was fabricated. The photodetector exhibited a linear current-voltage curve in visible light. The slope of the curve increased under ultraviolet (UV) irradiation, maintaining a linear shape of the curve. The curve reversibly returned to the initial shape in the absence of UV illumination. The UV on-off current ratio increased because of the decrease in the off-current by compensating for the oxygen vacancies through annealing in an oxygen atmosphere. Thus, in this study, we proposed a simple and efficient approach to fabricate single-crystal ZnO microrods for application in low-cost photodetectors. (C) 2020 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA CHEMICAL-BATH DEPOSITION PULSED-LASER DEPOSITION LOW-TEMPERATURE GROWTH THIN-FILM CATALYST-FREE ULTRAVIOLET PHOTODETECTORS VAPOR-DEPOSITION OXYGEN VACANCIES NANORODS FABRICATION Facile synthesis of ZnO microrod photodetectors by solid-state reaction Article 10.1016/j.jallcom.2020.154110 1 JOURNAL OF ALLOYS AND COMPOUNDS, v.825 JOURNAL OF ALLOYS AND COMPOUNDS 825 scie scopus 000514848600035 2-s2.0-85078829900 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article CHEMICAL-BATH DEPOSITION PULSED-LASER DEPOSITION LOW-TEMPERATURE GROWTH THIN-FILM CATALYST-FREE ULTRAVIOLET PHOTODETECTORS VAPOR-DEPOSITION OXYGEN VACANCIES NANORODS FABRICATION ZnO microrod Graphite 1D growth of ZnO Direct growth UV photodetectors