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학술지 Transition Behaviors in Biased Asymmetric Quantum Dot-in-Double-Well Photodetector
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저자
신현욱, 최정우, 이상준, 노삼규, 김준오, 이규석
발행일
201405
출처
Current Applied Physics, v.14 no.5, pp.721-724
ISSN
1567-1739
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.cap.2014.02.019
협약과제
13VB3100, 전력변환효율 75%급 LED 광소자공정 및 표준 분석기술 개발, 이규석
초록
A triple-band mid-/far-infrared (MIR/FIR) photodetector tunable by polarity is demonstrated by asymmetric quantum dot-in-double-well (DdWELL) structure that exhibits unique photoresponse (PR) transitions. In contrast to the MIR2 band with no dependence, the two MIR1/FIR PR bands are blue/red-shifted by the bias voltage, and the MIR2-FIR dual-band spectrum changes to a single-band feature due to the polarity. A four-level energy band model is proposed for the transition scheme, and the electric field dependence of the FIR band numerically calculated by a simplified DdWELL structure is in good agreement with the experimental PR spectra. © 2014 Published by Elsevier Ltd.
키워드
Asymmetric quantum well, Infrared photodetector, Photoresponse spectra, Quantum dot in double well
KSP 제안 키워드
Asymmetric quantum dot, Band feature, Double-well, Dual-band, Energy band model, Far-infrared, Quantum Dot(QD), Quantum Well(QW), Triple-band, bias voltage, electric field dependence