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ContributorsFuss, Christina M. (Performer) / Andre, Roland M. (Performer) / Barban, Naomi (Performer) / Novak, Gail (Pianist) (Performer) / ASU Library. Music Library (Publisher)
Created1994-04-09
ContributorsBessey, Molly Jo (Performer) / Novak, Gail (Pianist) (Performer) / Linn, Leslie (Performer) / Kim, Doosook (Performer) / Clark, Mai (Performer) / Barrett, Andreas (Performer) / Leavitt, LaReita (Performer) / ASU Library. Music Library (Publisher)
Created1995-04-29
ContributorsDavey, John (Performer) / Novak, Gail (Pianist) (Performer) / ASU Library. Music Library (Publisher)
Created1994-06-29
ContributorsLewis, Susan (Performer) / Novak, Gail (Pianist) (Performer) / Adams, Daniel (Performer) / Bessey, Molly Jo (Performer) / Hulihan, Charles (Performer) / ASU Library. Music Library (Publisher)
Created1996-04-18
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Description
In this dissertation research, conventional and aberration-corrected (AC) transmission electron microscopy (TEM) techniques were used to evaluate the structural and compositional properties of thin-film semiconductor compounds/alloys grown by molecular beam epitaxy for infrared photo-detection. Imaging, diffraction and spectroscopy techniques were applied to TEM specimens in cross-section geometry to extract information

In this dissertation research, conventional and aberration-corrected (AC) transmission electron microscopy (TEM) techniques were used to evaluate the structural and compositional properties of thin-film semiconductor compounds/alloys grown by molecular beam epitaxy for infrared photo-detection. Imaging, diffraction and spectroscopy techniques were applied to TEM specimens in cross-section geometry to extract information about extended structural defects, chemical homogeneity and interface abruptness. The materials investigated included InAs1-xBix alloys grown on GaSb (001) substrates, InAs/InAs1-xSbx type-II superlattices grown on GaSb (001) substrates, and CdTe-based thin-film structures grown on InSb (001) substrates.

The InAsBi dilute-bismide epitaxial films were grown on GaSb (001) substrates at relatively low growth temperatures. The films were mostly free of extended defects, as observed in diffraction-contrast images, but the incorporation of bismuth was not homogeneous, as manifested by the lateral Bi-composition modulation and Bi-rich surface droplets. Successful Bi incorporation into the InAs matrix was confirmed using lattice expansion measurements obtained from misfit strain analysis of high-resolution TEM (HREM) images.

Analysis of averaged intensity line profiles in HREM and scanning TEM (STEM) images of the Ga-free InAs/InAs1-xSbx type-II strained superlattices indicated slight variations in layer thickness across the superlattice stack. The interface abruptness was evaluated using misfit strain analysis of AC-STEM images, electron energy-loss spectroscopy and 002 dark-field imaging. The compositional profiles of antimony across the superlattices were fitted to a segregation model and revealed a strong antimony segregation probability.

The CdTe/MgxCd1-xTe double-heterostructures were grown with Cd overflux in a dual-chamber molecular beam epitaxy with an ultra-high vacuum transfer loadlock. Diffraction-contrast images showed that the growth temperature had a strong impact on the structural quality of the epilayers. Very abrupt CdTe/InSb interfaces were obtained for epilayers grown at the optimum temperature of 265 °C, and high-resolution imaging using AC-STEM revealed an interfacial transition region with a width of a few monolayers and smaller lattice spacing than either CdTe or InSb.
ContributorsLu, Jing (Author) / Smith, David J. (Thesis advisor) / Alford, Terry L. (Committee member) / Crozier, Peter A. (Committee member) / McCartney, Martha R. (Committee member) / Zhang, Yong-Hang (Committee member) / Arizona State University (Publisher)
Created2017
ContributorsOhm, Melanie (Performer) / Novak, Gail (Pianist) (Performer) / Apestegui de Powell, Ilse (Performer) / Stevens, Jeffrey (Performer) / Bish, Deborah (Performer) / James, Kortney (Performer) / Lynch, Charles W. (Performer) / ASU Library. Music Library (Publisher)
Created1999-04-02
ContributorsBessey, Molly Jo (Performer) / Novak, Gail (Pianist) (Performer) / ASU Library. Music Library (Publisher)
Created1996-03-31
ContributorsBrookens, Karen (Performer) / Novak, Gail (Pianist) (Performer) / Lund, Kara (Performer) / Childs, Linda (Performer) / Millar, Chad (Performer) / O'Donin, Shelly (Performer) / Stefan, Ted (Performer) / Harding, Christian (Performer) / Dahl, Stanley (Performer) / Hackbarth, Glenn, 1949- (Performer) / ASU Library. Music Library (Publisher)
Created1996-04-22
ContributorsBrookens, Karen (Performer) / Novak, Gail (Pianist) (Performer) / Leavitt, LaReita (Performer) / O'Donin, Shelly (Performer) / Stefan, Ted (Performer) / Reber, Margaret (Performer) / Childs, Linda (Performer) / ASU Library. Music Library (Publisher)
Created1995-02-09
ContributorsRinsema, Joel (Performer) / Novak, Gail (Pianist) (Performer) / Chorlton, Roberta (Performer) / Leavitt, LaReita (Performer) / Schrock, Patricia (Performer) / Ellsworth, Bonnie (Performer) / ASU Library. Music Library (Publisher)
Created1994-04-14