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학술지 Stabilized and Equalized Field-Emission Currents From Carbon Nanotube Emitters by Cascade Active-Current-Control
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저자
이정웅, 정진우, 강준태, 김재우, 박소라, 전효진, 고은솔, 안유정, 김대준, 송윤호
발행일
202003
출처
IEEE Transactions on Electron Devices, v.67 no.3, pp.1192-1197
ISSN
0018-9383
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TED.2019.2961206
협약과제
19JB1500, 고속, 가변 프레임의 디지털 엑스선 소스를 이용한 엑스선 투시 영상 시스템 기술 개발, 송윤호
초록
We have stabilized and equalized field-emission (FE) currents from carbon nanotube (CNT) emitters by a cascade active-current-control (ACC) using two transistors. Theoretical and experimental analyses on the cascade ACC operation, including single ACC with a single transistor, were done for both diode- A nd triode-configured CNT emitters. A fully vacuum-sealed CNT FE X-ray tube (FEXT) was used as a triode-configured test device. FE currents, in both configurations, by the cascade ACC were found to be stabilized to a standard deviation of 0.05% even in high-voltage and high-power circumstances while the single ACC could hardly regulate fluctuations in FE currents from CNT emitters. Furthermore, an array of CNT FEXTs successfully demonstrated a completely equalized emission current when the cascade ACC was employed. This result has important implications for FEXT current uniformity and other FEXTs applications, because the cascade ACC can equalize FE currents even through large variation of CNT emitters, thereby greatly enhancing the usability of FE devices.
KSP 제안 키워드
Carbon nano-tube(CNT), Carbon nanotube emitters, Current Control, Experimental analyses, High-voltage and high-power, Standard deviation(STD), Test device, emission current, field emission, fully vacuum-sealed, x-ray tube