Giparakis, M., Knötig, H., Detz, H., Beiser, M., Schrenk, W., Schwarz, B., Strasser, G., & Andrews, A. M. (2022). 2.7 μm quantum cascade detector: Above band gap energy intersubband detection. Applied Physics Letters, 120(7), 071104-1-071104–4. https://doi.org/10.1063/5.0076856
E362-01 - Forschungsbereich Optoelektronische Materialien E057-12 - Fachbereich Zentrum für Mikro und Nanostrukturen
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Journal:
Applied Physics Letters
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ISSN:
0003-6951
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Date (published):
14-Feb-2022
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Number of Pages:
4
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Publisher:
AIP Publishing
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Peer reviewed:
Yes
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Keywords:
quantum cascade detectors
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Abstract:
Quantum cascade detectors (QCDs) are mid-infrared and far-infrared, low-noise, photovoltaic detectors utilizing intersubband transitions. This Letter presents an InAs/AlAs0.16Sb0.84 based QCD lattice matched to an InAs substrate. This material system exhibits properties like a low effective electron mass of the well material of 0.023 m0, beneficial for higher optical absorption strength, and a high conduction band offset of 2.1 eV, allowing the design of QCDs in the mid-infrared and near-infrared region. The presented QCD has a peak spectral response at 2.7 μm (0.459 eV), the center of a CO2 absorption band. To enable top side illumination, a grating was implemented. This additionally bypasses absorption by the narrow bandgap 0.345 eV (3.54 μm) InAs substrate material. The QCD has a peak responsivity at a room temperature of 5.63 mA/W and a peak specific detectivity of 1.14 × 108 Jones.
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Research Areas:
Photonics: 50% Surfaces and Interfaces: 20% Nanoelectronics: 30%
CC BY 4.0
