Transition behaviors in biased asymmetric quantum dot-in-double-well photodetector

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...

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Bibliographic Details
Published in:Current applied physics 2014-05, Vol.14 (5), p.721-724
Main Authors: Shin, H.W., Choe, J.-W., Lee, S.J., Noh, S.K., Kim, J.O., Lee, K.-S.
Format: Article
Language:English
Subjects:
Asymmetric quantum well
Asymmetry
Band spectra
Bands
Infrared photodetector
Mathematical models
Photodetectors
Photoresponse spectra
Polarity
Quantum dot in double well
Qunatum dots
Spectra
Voltage
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Summary: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. •An asymmetric quantum-dot in double well (DdWELL) structure is newly designed.•The triple-band mid-/far-infrared (MIR/FIR) photodetector is tunable by polarity.•MIR/FIR PR bands are blue/red-shifted by the bias voltage.•MIR–FIR dual-band spectrum is changed to single-band by the polarity.•A four-level energy band diagram is proposed for the origin of the PR transitions.
ISSN:1567-1739
1878-1675
DOI:10.1016/j.cap.2014.02.019