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Mid-infrared GaSb-based resonant tunneling diode photodetectors for gas sensing applications.

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Název: Mid-infrared GaSb-based resonant tunneling diode photodetectors for gas sensing applications.
Autoři: Rothmayr, F., Kistner, C., Koeth, J., Pfenning, A., Knebl, G., Schade, A., Krueger, S., Worschech, L., Hartmann, F., Höfling, S.
Zdroj: Applied Physics Letters; 4/16/2018, Vol. 112 Issue 16, pN.PAG-N.PAG, 5p
Témata: PHOTODETECTORS, RESONANT tunneling diodes, GAS detector testing, RESONANT tunneling, PERFORMANCE of gas detectors
Abstrakt: We present resonant tunneling diode-photodetectors (RTD-PDs) with GaAs0.15Sb0.85/AlAs0.1Sb0.9 double barrier structures combined with an additional quaternary Ga0.64In0.36As0.33Sb0.67 absorption layer covering the fingerprint absorption lines of various gases in the mid-infrared wavelength spectral region. The absorption layer cut-off wavelength is determined to be 3.5 μm, and the RTD-PDs show peak-to-valley current ratios up to 4.3 with a peak current density of 12 A/cm−2. The incorporation of the quaternary absorption layer enables the RTD-PDs to be sensitive to illumination with light up to the absorption lines of HCl at 3395 nm. At this wavelength, the detector shows a responsivity of 6.3 mA/W. At the absorption lines of CO2 and CO at 2004 nm and 2330 nm, respectively, the RTD-PDs reach responsivities up to 0.97 A/W. Thus, RTD-PDs pave the way towards high sensitive mid-infrared detectors that can be utilized in tunable laser absorption spectroscopy. [ABSTRACT FROM AUTHOR]
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Abstrakt:We present resonant tunneling diode-photodetectors (RTD-PDs) with GaAs<subscript>0.15</subscript>Sb<subscript>0.85</subscript>/AlAs<subscript>0.1</subscript>Sb<subscript>0.9</subscript> double barrier structures combined with an additional quaternary Ga<subscript>0.64</subscript>In<subscript>0.36</subscript>As<subscript>0.33</subscript>Sb<subscript>0.67</subscript> absorption layer covering the fingerprint absorption lines of various gases in the mid-infrared wavelength spectral region. The absorption layer cut-off wavelength is determined to be 3.5 <italic>μ</italic>m, and the RTD-PDs show peak-to-valley current ratios up to 4.3 with a peak current density of 12 A/cm<sup>−2</sup>. The incorporation of the quaternary absorption layer enables the RTD-PDs to be sensitive to illumination with light up to the absorption lines of HCl at 3395 nm. At this wavelength, the detector shows a responsivity of 6.3 mA/W. At the absorption lines of CO<subscript>2</subscript> and CO at 2004 nm and 2330 nm, respectively, the RTD-PDs reach responsivities up to 0.97 A/W. Thus, RTD-PDs pave the way towards high sensitive mid-infrared detectors that can be utilized in tunable laser absorption spectroscopy. [ABSTRACT FROM AUTHOR]
ISSN:00036951
DOI:10.1063/1.5025531