An asymmetric quantum well infrared photodetector with voltage-tunable narrow and broad-band response

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DOIResolve DOI: http://doi.org/10.1063/1.361230
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TypeArticle
Journal titleJournal of Applied Physics
ISSN00218979
Volume79
Issue6
Pages33073311; # of pages: 5
SubjectALUMINIUM ARSENIDES; GALLIUM ARSENIDES; INFRARED RADIATION; LINE WIDTHS; PHOTODETECTORS; QUANTUM WELLS; SPECTRAL RESPONSE; TUNING; VOLTAGE DEPENDENCE
AbstractWe describe a 9 �m AlGaAs/GaAs asymmetric quantum well infrared photodetector with voltage tunable spectral bandwidth. A very narrow spectral response of 9.2 meV (0.6 �m) full width half maximum is observed for an applied electric field of 28 kV/cm. The linewidth quadruples when the bias polarity is reversed, with very little shift in the peak detection wavelength. This structure is based on a conventional intersubband photodetector modified by using AlGaAs barriers that are graded in Al content and by adding a thin AlGaAs confinement layer on one side of the well. The asymmetry in the barriers is shown to give rise to the dependence of the spectral linewidth on applied bias. As well, a series of unusually well-resolved and intense bound-to-continuum transitions are observed at low bias, that may indicate that the unique barrier shape also leads to enhanced electron interference effects at the well/barrier interfaces.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Microstructural Sciences
Peer reviewedYes
Identifier10011936
NPARC number12338923
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Record identifierd0b5f8f5-322a-450c-a597-fa929f0c5734
Record created2009-09-11
Record modified2016-05-09
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