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dc.contributor.authorPlis, Elena A.
dc.date.accessioned2007-09-09T06:15:44Z
dc.date.available2007-09-09T06:15:44Z
dc.date.issued2007-09-09T06:15:44Z
dc.date.submittedMay 2007
dc.identifier.urihttp://hdl.handle.net/1928/3282
dc.description.abstractThe detection of mid-wavelength infrared radiation (MWIR) is very important for many military, industrial and biomedical applications. Present-day commercially available uncooled IR sensors operating in MWIR region (2-5µm) use microbolometric detectors which are inherently slow. Available photon detectors (mercury cadmium telluride (MCT), bulk InSb and quantum well infrared detectors (QWIPs))overcome this limitation. However, there are some fundamental issues decreasing their performance and ability for high temperature operation, including fast Auger recombination rates and high thermal generation rate. These detectors operate at low temperatures (77K-200K) in order to obtain high signal to noise ratio. The requirement of cooling limits the lifetime, increases the weight and the total cost, as well as the power budget, of the whole infrared system. In recent years, InAs/GaSb superlattice based detectors have appeared as an interesting alternative to the present-day IR detector systems. These heterostructures have a type-II band alignment such that the conduction band of InAs layer is lower than the valence band of GaSb layer. The effective bandgap of these structures can be adjusted from 0.4 eV to values below 0.1 eV by varying the thickness of constituent layers leading to an enormous range of detector cutoff wavelengths (3-30µm). The InAs/GaSb SLs have a higher degree of uniformity than the MCT alloys, making them attractive for large area focal plane arrays. They provide a smaller leakage current due to larger effective electron mass, which suppresses tunneling. This material system is also characterized by high operating temperatures and long Auger recombination rates. This suggests the potential for using the SLs technology for realizing high operating temperature devices. This work is focused on the development of mid-IR InAs/GaSb SLs sensors with high-operating temperature. Contributions of this thesis include 1) development of growth and processing procedure for the n-on-p and p-on-n design of SL detectors leading to improved detector performance, 2) careful evaluation of characteristics of SL detectors, 3) methods of reduction of surface component of dark current passivation techniques).en_US
dc.format.extent3031753 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.subjectInfrared Sensorsen_US
dc.subjectSuperlatticeen_US
dc.subjectInAs/GaSben_US
dc.subjectFocal Plane Arrayen_US
dc.subject.lcshInfrared detectors--Materials
dc.subject.lcshSuperlattices as materials
dc.titleMid-IR type-II InAs/GaSb nanoscale superlattice sensorsen_US
dc.typeDissertationen_US
dc.description.degreeDoctor of Engineeringen
dc.description.levelDoctoralen
dc.description.departmentUniversity of New Mexico. Dept. of Electrical and Computer Engineeringen
dc.description.advisorKrishna, Sanjay
dc.description.committee-memberAceves, Alejandro
dc.description.committee-memberStintz, Andreas
dc.description.committee-memberHuffaker, Diana


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