| 학회 |
한국재료학회 |
| 학술대회 |
2019년 가을 (10/30 ~ 11/01, 삼척 쏠비치 호텔&리조트) |
| 권호 |
25권 2호 |
| 발표분야 |
F. 광기능/디스플레이 재료 분과 |
| 제목 |
Facile synthesis of ZnO microrod photodetectors by solid state reaction |
| 초록 |
ZnO microrods were directly synthesized by a single-step solid state reaction using ZnO powders mixed with graphite without a catalyst under air atmosphere instead of vacuum systems and carrying gases. A detailed study of the structure and growth mechanism of microrods and their electrical and optical properties were systemically investigated. Single crystal ZnO microrods were confirmed with high-resolution transmission electron microscopy. Green emission at photoluminescence spectra suggests nonstoichiometric ZnO microrods were formed due to oxygen vacancy during sintering. Length and width of ZnO microrods could be modulated by controlling the graphite contents, sintering temperature and retention time. A simple photodetector consisted of a single ZnO microrod on SiO2 substrate exhibits a linear current-voltage curve in dark condition. The slope of current-voltage curve increased under ultraviolet radiation maintaining linear shape and the curve reversibly went back to the initial curve after removing ultraviolet light source. The ultraviolet on-off ratio increased attributed to the decreasing dark current by compensating oxygen vacancy through annealing in oxygen atmosphere. Our approach provides a simple and effective way to fabricate single crystal ZnO microrods and their application to a low cost photodetector. |
| 저자 |
이한진, 정현규, 문정흠, 김동훈
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| 소속 |
명지대 |
| 키워드 |
ZnO microrods; Graphite; Direct growth; Simple UV photodetectors
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| E-Mail |
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