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Transition Behaviors in Biased Asymmetric Quantum Dot-in-Double-Well Photodetector
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- Authors
- H.W. Shin, J.-W. Choe, S.J. Lee, S.K. Noh, J.O. Kim, K.-S. Lee
- Issue Date
- 2014-05
- Citation
- Current Applied Physics, v.14, no.5, pp.721-724
- ISSN
- 1567-1739
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- 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.
- KSP Keywords
- Asymmetric quantum dot, Band feature, Bias voltage, Double-well, Dual-band, Energy band model, Quantum dot(Qdot), Triple-band, electric field dependence, far-infrared, single-band