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dc.contributor.authorMatthews, Kristopheren_US
dc.date.accessioned2013-07-23T18:23:45Z
dc.date.available2016-06-01T06:15:47Z
dc.date.issued2011-01-31en_US
dc.identifier.otherbibid: 8213852
dc.identifier.urihttps://hdl.handle.net/1813/33557
dc.description.abstractThis thesis work features the exploration of the capabilities and limitations of devices based on MBE (Molecular Beam Epitaxy) grown IIInitride materials under three principal applications: photovoltaics, high electron mobility transistors (HEMTs), and terahertz emitters. InGaN solar cells covering the deep UV to the red ranges of the solar spectrum were fabricated. The increase in indium composition in the alloys to absorb longer wavelengths resulted in considerable leakage and series resistance caused by a combination of surface electron accumulation and electrically active line defects. A combination of thermal annealing, improved ohmic contact metal selection, electrochemical anodization, and grain coarsening resulted in improved performance. Higher sheet densities and sheet current with minimal leakage was obtained in an AlGaN/GaN HEMT by optimizing the design to include a GaN cap as a tunneling barrier and an AlN interbarrier to increase 2DEG confinement. Furthermore, a novel technique using a 325 nm, surface sensitive laser to perform micro-Raman thermal mapping on HEMTs was developed. The technique utilized higher order A1(LO) phonons for higher thermal sensitivity. Lastly, progress was made toward GaN THz emitter development by achieving low series resistance operation through improved metal contact selection and ultra high Ge donor doping via MBE.en_US
dc.language.isoen_USen_US
dc.subjectgallium nitrideen_US
dc.subjectiii-nitrideen_US
dc.subjectganen_US
dc.subjectinganen_US
dc.subjectsolaren_US
dc.subjectpven_US
dc.subjecthemten_US
dc.subjecthfeten_US
dc.subjectterahertzen_US
dc.subjectmbeen_US
dc.titleMbe Growth Of High Performance Nitride Devices For Energy, Communications, And Defense Applicationsen_US
dc.typedissertation or thesisen_US
thesis.degree.disciplineMaterials Science and Engineering
thesis.degree.grantorCornell Universityen_US
thesis.degree.levelDoctor of Philosophy
thesis.degree.namePh. D., Materials Science and Engineering
dc.contributor.chairEastman, Lester Fuessen_US
dc.contributor.committeeMemberClancy, Pauletteen_US
dc.contributor.committeeMemberSpencer, Michael G.en_US


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