A5014783284- Semiconductor Quantum Structures and Devices
- Fuel Cells and Related Materials
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Semiconductor Detectors and Materials
- Electrocatalysts for Energy Conversion
- Semiconductor materials and devices
- Advanced battery technologies research
- 2D Materials and Applications
- Graphene research and applications
- Topological Materials and Phenomena
- Chalcogenide Semiconductor Thin Films
- MXene and MAX Phase Materials
- Quantum Dots Synthesis And Properties
- solar cell performance optimization
Arizona State University
1999-2013
European Council for an Energy Efficient Economy
2001
Significant performance enhancement in nanofiber-based PEMFCs featuring highly O 2 permeable ionomer films, proton-conductive fibers, and increased active sites.
Misfit dislocations were used to modify the surface morphology and attain spatial ordering of quantum dots (QDs) by molecular beam epitaxy. Effects anneal time temperature on strain-relaxed InxGa1−xAs/GaAs layers subsequent InAs QDs investigated. Photoluminescence (PL) time-resolved PL was study effects increased QD positional ordering, uniformity, their proximity dislocation arrays optical properties. Narrower inhomogeneous broadening from ordered observed, differences in dynamics found.
Deep-level transient spectroscopy measurements in InAs quantum dots (QDs) grown both n-GaAs and p-GaAs show that tunneling is an important mechanism of carrier escape from the dots. The doping level barrier strongly affects emission rates, enabling or preventing detection a capacitance signal given QD level. relative intensity this acquired with different rate windows allows estimation energies.
Spectroscopic ellipsometry (SE) and diffuse reflection spectroscopy (DRS) are used to control the Ga mole fraction substrate temperature, respectively, during growth of InGaAs lattice matched InP. is controlled within ±0.002 its target value temperature ±2 °C value. The same under constant thermocouple would result in a 50 rise real composition 1% above In both cases, feedback achieved using nested proportional-integral-derivative (PID) loop, where, inner loop consists conventional...
Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – 5, 2010.