Highly sensitive GaAs/AlGaAs heterojunction bolometer

  1. Get@NRC: Highly sensitive GaAs/AlGaAs heterojunction bolometer (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.sna.2011.02.017
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Journal titleSensors and Actuators, A: Physical
Pages245248; # of pages: 4
SubjectDoping densities; Emitter doping; GaAs; GaAs/AlGaAs; Heterojunction structures; High temperature coefficient; Highly sensitive; Infrared response; Low temperatures; Multilayer Heterojunction; N-doped; Optimum parameters; Room temperature; TCR; Bolometers; Doping (additives); Gallium; Infrared detectors; Multilayers; Phosphorus; Heterojunctions
AbstractGaAs/AlGaAs multilayer heterojunction structures with different aluminum (Al) fractions and emitter doping densities were tested to identify optimum parameters for high temperature coefficient of resistance (TCR). Higher Al fractions and lower doping densities showed higher TCR. Additionally, p-doped heterojunction structures showed a higher TCR compared to an n-doped one with similar parameters. A p-doped multilayer superlattice heterojunction structure with 30 periods of GaAs/Al 0.57Ga 0.43As junctions, operating at room temperature showed a TCR of ∼4% and bolometer like infrared (IR) response up to 20 μm with a D * of 1.7 × 10 6 Jones. This TCR is higher than that of VO x or α-Si bolometers. At low temperatures (50 K) some of these devices have shown TCR values of over 30%. © 2011 Elsevier B.V. All rights reserved.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Microstructural Sciences (IMS-ISM)
Peer reviewedYes
NPARC number21271503
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Record identifier54104952-158d-4d73-a18a-7be459dde050
Record created2014-03-24
Record modified2016-05-09
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