Journal article
Design of Phosphorus-Containing MWIR Type-II Superlattices for Infrared Photon Detectors
IEEE journal of selected topics in quantum electronics, Vol.19(5), pp.1-6
09/01/2013
DOI: 10.1109/JSTQE.2012.2222358
Abstract
Type-II strained layer superlattices (SLSs) offer a broad range of design degrees of freedom to help optimize their properties as absorber layers of infrared photon detectors. We theoretically examine a new class of mid-wavelength infrared (2-5 mu m bandpass) Type-II structures with two-layer InGaSb/InPSb and four-layer InAs/GaSb/InAs/InPSb SLS periods. Phosphorous-containing SLSs are a promising approach to improving infrared photon detector performance due to providing a new set of material properties, including favorable valence band offsets. P-based SLSs of four-layer type InAs/GaSb/InAs/InPSb were found to be among the best 5-mu m gap SLSs that we have modeled. Among the studied designs, the lowest dark current in an ideal structure is predicted for a four-layer 23.6 angstrom InAs/20 angstrom GaSb/23.6 angstrom InAs/60 angstrom InP0.62Sb0.38 SLS. Its predicted ideal dark current is about 35 times lower than an n-type HgCdTe-based photodiode absorber and six times lower than a p-type HgCdTe one for the same bandgap, temperature, and dopant concentration. We also discuss a defect mitigation strategy that involves positioning the SLS gap in an energy range that avoids defect levels and show how this applies to the aforementioned P-containing SLS.
Details
- Title: Subtitle
- Design of Phosphorus-Containing MWIR Type-II Superlattices for Infrared Photon Detectors
- Creators
- Christoph H. Grein - University of Illinois at ChicagoMichael E. Flatte - University of IowaAllan J. Evans - SensorsAndrew D. Hood - SensorsWilliam E. Tennant - SensorsVaidya Nathan - United States Air Force Research Laboratory
- Resource Type
- Journal article
- Publication Details
- IEEE journal of selected topics in quantum electronics, Vol.19(5), pp.1-6
- Publisher
- IEEE
- DOI
- 10.1109/JSTQE.2012.2222358
- ISSN
- 1077-260X
- eISSN
- 1558-4542
- Number of pages
- 6
- Grant note
- Air Force Research Laboratory
- Language
- English
- Date published
- 09/01/2013
- Academic Unit
- Electrical and Computer Engineering; Physics and Astronomy
- Record Identifier
- 9984429047002771
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