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

F Rothmayr, A Pfenning, C Kistner, J Koeth, G Knebl, A Schade, S Krueger, l Worschech, F Hartmann, Sven Höfling

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19 Citations (Scopus)


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 peak current densities of 12 A/cm-2.The incorporation of the quaternary absorption layer enables the RTD-PD 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-PD reaches 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.
Original languageEnglish
Article number161107
Number of pages5
JournalApplied Physics Letters
Issue number16
Early online date20 Apr 2018
Publication statusPublished - Apr 2018


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