MIOMD-XI Speakers    
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1.  Dr. Elizabeth Steenbergen, Air Force Research Labs, USA
Late-Breaking Results: InAs/InAs1-xSbx superlattices on GaSb substrates: a promising alternative type-II superlattice infrared material system
Speaker Biography: Elizabeth Steenbergen is an engineer at the Air Force Research Lab. She received her MS and PhD in Electrical Engineering at Arizona State University in May 2009 and 2012, respectively. She accepted the Science Foundation Arizona fellowship and the DOD SMART scholarship during graduate school and was awarded the Palais Outstanding Doctoral Student award in Electrical Engineering at ASU.

Summary: As one of the many promising antimonide Type-II superlattices (T2SLs), InAs/InAs1-xSbx T2SLs have been proposed for MWIR and LWIR light emitting diodes, lasers, and photodetectors. Although MWIR and LWIR InAs/InAs1-xSbx T2SL structures grown on InAs substrates and GaSb substrates3 were successfully demonstrated in the 1990’s, they were set aside as a potential photodetector material in favor of the InAs/Ga1-xInxSb SL. Currently, the short minority carrier lifetime, ~30 ns, of the InAs/Ga1-xInxSb T2SL limits the detector performance as evidenced by higher than predicted dark currents and reduced quantum efficiencies.
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