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Helium behavior at fcc-bcc semicoherent interfaces: trapping, clustering, nucleation, and growth of cavities
(Massachusetts Institute of Technology, 2013)
He implanted into metals precipitates into nanoscale bubbles that grow into voids, degrading the properties of engineering alloys in nuclear energy applications. In this thesis, multi-scale modeling techniques and neutron ...
Enhancing stability of powder-route nanocrystalline tungsten-titanium via alloy thermodynamics
(Massachusetts Institute of Technology, 2013)
Improvement in material properties as a result of grain size refinement to the nanoscale is often limited by an inherent tendency of these nanostructured materials to coarsen especially at the high temperatures required ...
Virus-enabled synthesis and 2D/3D assembly of nanowire networks
(Massachusetts Institute of Technology, 2013)
Dense networks of high aspect ratio nanowires can provide important functionality to electronic devices through a unique combination of electronic and structural properties including high conductivity, high surface area, ...
Integration of GaAsP alloys on SiGe virtual substrates for Si-based dual-junction solar cells
(Massachusetts Institute of Technology, 2013)
Integration of III-V compound semiconductors with silicon is an area that has generated a lot of interest because III-V materials and Si are best suited for different types of devices. Monolithic integration enables the ...
Atomistic simulations of radiation damage in amorphous metal alloys
(Massachusetts Institute of Technology, 2013)
While numerous fundamental studies have characterized the atomic-level radiation response mechanisms in irradiated crystalline alloys, comparatively little is known regarding the mechanisms of radiation damage in amorphous ...
Synthesis, characterization and assembly of the binary ligand protected gold nanoparticles
(Massachusetts Institute of Technology, 2013)
When a gold nanoparticle is coated with two dislike ligands, the ligands selfassemble on the nanoparticle surface and the phase separation occurs based on the miscibility and the size mismatch of two ligands, and the sizes ...
Development of low-temperature solution-processed colloidal quantum dot-based solar cells
(Massachusetts Institute of Technology, 2013)
Solution-processed solar cells incorporating organic semiconductors and inorganic colloidal quantum dots (QDs) are potential alternatives to conventional solar cells fabricated via vacuum or high-temperature sintering ...
Design of a stable nanocrystalline alloy
(Massachusetts Institute of Technology, 2013)
Nanocrystalline materials are inherently unstable due to their high material fraction of grain boundaries, preventing their improved properties from being used in application. To stabilize the nanoscale grain size against ...
Photovoltaic properties and size-pH phase stability of iron disulfide from density-functional theory
(Massachusetts Institute of Technology, 2013)
Despite its exceptional optical absorptivity, suitable band gap, and earth abundance, the low open-circuit voltage of pyrite FeS₂ has remained the biggest challenge preventing its use in photovoltaic devices. Two widely-accepted ...