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HL: Fachverband Halbleiterphysik
HL 59: THz and MIR physics in semiconductors
HL 59.9: Talk
Thursday, March 19, 2020, 12:00–12:15, POT 151
Interband Cascade Photodetectors for Light Detection in the mid Infrared — •Andreas Bader1, Anne Schade1, Florian Rothmayr2, Caroline Kistner2, Johannes Koeth2, Fabian Hartmann1, and Sven Höfling1 — 1Technische Physik, Physikalisches Institut, Julius-Maximilians-Universität Würzburg — 2nanoplus Nanosystems and Technologies GmbH, Gerbrunn
Interband cascade photodetectors (ICD) [1] based on InAs/GaSb type-II superlattice (SL) absorbers present a novel type of photodetectors for applications in the infrared spectral region. By adjusting the period of the SL, the cut-off wavelength can be tailored in a wide range from SWIR (1-3µm) up to VLWIR (> 14µm) [2]. Cascading multiple discrete absorbers in series allows for high absorption while mitigating internal losses in the absorber within the carrier diffusion length. Furthermore, cascading reduces the overall noise leading to a higher detectivity [3]. These properties allow for the use of ICDs in multiple possible applications like gas sensing, thermal imaging and medical diagnostics. We present our work on a five-stage ICD for gas sensing applications in the MIR. A responsivity of 0.24 A/W was achieved in photovoltaic operation at room temperature. The ICD shows a cut-off wavelength of 4.7µm. The absorption of gaseous H2O and CO2 was investigated and clear absorption lines were resolved.
[1] Li et al, APL, 86, 10 (2005)
[2] Christol et al, Proc. of SPIE, 10563, 204 (2017)
[3] Hinkey et al, 114, 104506 (2013)