Space charge mediated negative differential resistance in terahertz quantum well detectors

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DOIResolve DOI: http://doi.org/10.1063/1.3605480
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TypeArticle
Journal titleJournal of Applied Physics
ISSN0021-8979
Volume110
Issue1
Article number13714
SubjectCurrent measurements; Electron kinetics; Electronic transport; Inter-subband; Many-body effect; Multi-quantum well structures; Negative differential resistances; Negative differential resistivity; Partially drained; Regime transition; Strong currents; Structure reorganizations; Terahertz quantum wells; Impact ionization; Infrared detectors; Optoelectronic devices; Quantum chemistry; Semiconductor device structures; Semiconductor quantum wells; Quantum well infrared photodetectors
AbstractIn terahertz quantum well infrared photodetectors, a built-in-charge- mediated regime transition of the electronic transport is thoroughly investigated. The very strong current discontinuity and negative differential resistivity behavior are explained in terms of band structure reorganizations. The analysis of bias versus current measurements reveals that the transition occurs when the first two wells of the structure become partially drained, and the second well enters the ionized regime before the first one. Both many-body effects and a careful model of the contact have to be considered to account for these features. The source of the built-in charge is identified as intersubband impact ionization. The regime transition is one of its few experimental proofs, and provides an original approach to investigate hot electron kinetics in multi-quantum-well structures. © 2011 American Institute of Physics.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Microstructural Sciences (IMS-ISM)
Peer reviewedYes
NPARC number21271422
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Record identifier193bc199-236e-49b8-bf99-22248a11d7e0
Record created2014-03-24
Record modified2016-05-09
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