Browsing Materials Science and Engineering - Ph.D. / Sc.D. by Title
Now showing items 376-395 of 1037
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GaAsP/InGaP heterojunction bipolar transistors for III-V on Si microelectronics
(Massachusetts Institute of Technology, 2017)GaAs-based transistors are capable of operating at high frequency with low noise, and are produced in large volumes for a wide range of applications including microwave frequency ICs for input/output in mobile devices. ... -
Gain effect waveguide optical amplifiers for Si microphotonics
(Massachusetts Institute of Technology, 2004)(cont.) Er-based gain. We reported the first infrared photoluminescence PL study of Er₂O₃ and found a 7 ms lifetime at 4 K, attributed to a metastable FCC or HCP phase. We showed the thermodynamically stable BCC crystal ... -
Ge and GeSi electroabsorption modulator arrays via strain and composition engineering
(Massachusetts Institute of Technology, 2020)Electronic and photonic integrated circuits serve as a promising platform for telecommunications and sensing applications. Electroabsorption modulators allow fast modulation, small device footprint, and low power consumption. ... -
Ge photodetectors for Si microphotonics
(Massachusetts Institute of Technology, 2001)This thesis demonstrates the integration of pure Ge near-infrared photodetectors on Si. Ge epilayers were grown directly on Si by a two-step ultra-high-vacuum/chemical-vapor-deposition (UHV/CVD) process. This work conclusively ... -
Ge-on-Si laser for silicon photonics
(Massachusetts Institute of Technology, 2013)Ge-on-Si devices are explored for photonic integration. Importance of Ge in photonics has grown and through techniques developed in our group we demonstrated low density of dislocations (<1x109cm-2) and point defects Ge ... -
Ge-on-Si light-emitting materials and devices for silicon photonics
(Massachusetts Institute of Technology, 2009)The rapid growing needs for high data transmission bandwidth challenge the metal interconnection technology in every area from chip-level interconnects to long distance communication. Silicon photonics is an ideal platform ... -
Gene-supplemented collagen-glycosaminoglycan scaffolds for nonviral gene delivery in articular cartilage tissue engineering
(Massachusetts Institute of Technology, 2006)Three-dimensional scaffolds and growth factors have been shown to be important for articular cartilage tissue engineering. A major problem in using recombinant proteins in vivo, however, is the inability to maintain ... -
A general mechanism of martensitic nucleation.
(Massachusetts Institute of Technology, 1974) -
Generalized interaction coefficients.
(Massachusetts Institute of Technology, 1965) -
Generalized phononic networks : of length scales, symmetry breaking and (non) locality : "controlling complexity through simplicity"
(Massachusetts Institute of Technology, 2011)The manipulation and control of phonons is extremely important from both a fundamental scientific and applied technological standpoint, providing applications ranging from sound insulation to heat management. Phononic ... -
Geometrical control of domain walls and the study of domain wall properties of materials with perpendicular magnetic anisotropy
(Massachusetts Institute of Technology, 2017)Magnetic based devices such as hard disk drives (HDDs) are widely used in the computer industry because of their high memory capacity, non-volatility and low cost compared to semiconductor-based solid state disk drives ... -
Germanium on silicon heteroepitaxy for high efficiency photovoltaic devices
(Massachusetts Institute of Technology, 2016)Optoelectronic devices based on III-V direct gap semiconductors enable efficient energy conversion for photovoltaic cells, light emission for LEDs, and on-chip communication via various microphotonic components. However, ... -
Germanium-on-silicon virtual substrate for lateral multijunction photovoltaics
(Massachusetts Institute of Technology, 2020)Lateral multijunction photovoltaics based on III-V direct band gap semiconductors enable efficient energy conversion. However, lattice matching between cell and substrate requires the use of expensive Ge or III-V substrates, ... -
Germanium-rich silicon-germanium materials for field-effect modular application
(Massachusetts Institute of Technology, 2008)The development of electric-field-induced optical modulation in the materials capable of monolithically integrated on silicon (Si) substrates offer the possibility of high-speed modulation in a pico second timeframe as ... -
GeSi photodetectors and electro-absorption modulators for Si electronic-photonic integrated circuits
(Massachusetts Institute of Technology, 2007)The silicon electronic-photonic integrated circuit (EPIC) has emerged as a promising technology to break through the interconnect bottlenecks in telecommunications and on-chip interconnects. High performance photonic ... -
Glass formation and thermal history.
(Massachusetts Institute of Technology, 1977) -
Gradient-Index (GRIN) lenses by Slurry-based Three-Dimensional Printing (S-3DP)
(Massachusetts Institute of Technology, 2005)GRIN lenses with vertical index variation and radial index variation have been successfully fabricated using S-3DPTM. Two silica-based material systems, A1203-SiO₂ and BaO-SiO₂, have been studied and used for the fabrication ... -
Grain boundary chemistry and morphology of heavily doped cerium dioxide
(Massachusetts Institute of Technology, 1998)Ceria is a model system for oxygen ion conducting ceramics of the cubic fluorite structure, in which grain boundaries are known to limit the overall ionic conductivity of polycrystals. Measurements of grain boundary ... -
Grain boundary defect chemistry and electrostatic potential in acceptor- and donor-doped titanium dioxide
(Massachusetts Institute of Technology, 1992) -
Grain boundary mobility and segregation in non-stoichiometric solid solutions of magnesium aluminate spinel
(Massachusetts Institute of Technology, 1985)
