A5001857076- Advanced Thermoelectric Materials and Devices
- Thermal properties of materials
- Thermal Radiation and Cooling Technologies
- Building Energy and Comfort Optimization
- Smart Grid Energy Management
- Semiconductor materials and interfaces
- Energy Efficiency and Management
- Solar Thermal and Photovoltaic Systems
- Advanced Thermodynamics and Statistical Mechanics
- Innovative Energy Harvesting Technologies
- Semiconductor Quantum Structures and Devices
- Photovoltaic System Optimization Techniques
- Nanofluid Flow and Heat Transfer
- Silicon Nanostructures and Photoluminescence
- Phase Change Materials Research
- nanoparticles nucleation surface interactions
- Graphene research and applications
- Water Quality Monitoring Technologies
- Energy Harvesting in Wireless Networks
- Solar Energy Systems and Technologies
- Silicon and Solar Cell Technologies
- Solar Radiation and Photovoltaics
- Machine Learning in Materials Science
- Metal and Thin Film Mechanics
- Surface and Thin Film Phenomena
Samsung (South Korea)
2024
Santa Clara University
2013-2023
Washington University in St. Louis
2021
Daejeon University
2019
Massachusetts Institute of Technology
1999-2014
Boston College
2008
IIT@MIT
2007
Seoul National University
2003
Abstract Many of the recent advances in enhancing thermoelectric figure merit are linked to nanoscale phenomena found both bulk samples containing constituents and themselves. Prior theoretical experimental proof‐of‐principle studies on quantum‐well superlattice quantum‐wire have now evolved into nanostructured prepared by chemical or physical approaches. In this Review, nanostructural composites shown exhibit nanostructures properties that show promise for applications, thus bringing...
A dimensionless thermoelectric figure-of-merit (ZT) of 0.95 in p-type nanostructured bulk silicon germanium (SiGe) alloys is achieved, which about 90% higher than what currently used space flight missions, and 50% the reported record SiGe alloys. These materials were made by using a direct current-induced hot press mechanically alloyed nanopowders that initially synthesized ball milling commercial grade Si Ge chunks with boron powder. The enhancement ZT due to large reduction thermal...
Multiwalled carbon nanotubes (CNTs) as produced are usually entangled and not ready to be dispersed into fluids. We treated CNTs by using a concentrated nitric acid disentangle CNT aggregates for producing nanofluids. Oxygen-containing functional groups have been introduced on the surfaces more hydrophilic formed during this treatment, which enabled make stable homogeneous Treated were successfully polar liquids like distilled water, ethylene glycol without need of surfactant nonpolar fluid...
The dimensionless thermoelectric figure of merit (ZT) the n-type silicon germanium (SiGe) bulk alloy at high temperature has remained about one for a few decades. Here we report that by using nanostructure approach, peak ZT 1.3 900 °C in an nanostructured SiGe been achieved. enhancement comes mainly from significant reduction thermal conductivity caused enhanced phonon scattering off increased density nanograin boundaries. will make such materials attractive many applications as solar,...
Abstract Thermoelectric power sources have consistently demonstrated their extraordinary reliability and longevity for deep space missions small unattended terrestrial systems. However, more efficient bulk materials practical devices are required to improve existing technology expand into large‐scale waste heat recovery applications. Research has long focused on complex compounds that best combine the electrical properties of degenerate semiconductors with low thermal conductivity glassy...
The mechanism for phonon scattering by nanostructures and point defects in nanostructured silicon (Si) the germanium (Ge) alloy their thermoelectric properties are investigated. We found that thermal conductivity is reduced a factor of 10 Si comparison with bulk crystalline Si. However, nanosize interfaces not as effective phonons wavelengths shorter than 1 nm. further 5 at. % Ge replacing very efficient nm, resulting reduction 2, thereby leading to figure merit 0.95 Si95Ge5, similar large...
The recent achievement of the high thermoelectric figure merit in nanograined materials is attributed to successful optimization consolidation process. Despite a thermal conductivity reduction, it has been experimentally observed that porous have lower than their bulk counterpart due significant reduction electrical conductivity. In this paper, nanoscale porosity effects on electron and phonon transport are modeled predict explain properties materials. Electron scattering at pores treated...
Nanocomposite thermoelectric materials have attracted much attention recently due to experimental demonstrations of improved properties over those the corresponding bulk material. In order better understand reported data and gain insight into transport in nanocomposites, we use Boltzmann equation under relaxation-time approximation calculate $n$-type $p$-type SiGe nanocomposites. We account for strong grain-boundary scattering mechanism nanocomposites using phonon electron models. The...
Recent reports on enhanced thermoelectric figure of merits based nanoscale effects have revived interest in potential applications modules for waste heat recovery and distributed power generation. However, studies optimized working conditions not been thoroughly investigated. The majority the previous optimum load resistance maximum output or efficiency assume temperatures at ends materials are known constant. In reality, temperature should be determined by energy conservation equations,...
We present a bottom-up model of III-V multi-junction cells, as well high concentration PV (HCPV) module. calculate $0.59/W(DC) manufacturing costs for our HCPV module design with today's capabilities, and find that reducing cell increasing efficiency offer the most promising paths future cost reductions. Cell could be significantly reduced via substrate reuse improved yields.
Surface-channel strained-Ge (s-Ge) p-MOSFETs with high- <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">K</i> /metal gate stack and ozone surface passivation are fabricated, for the first time. The channel is ultrathin (approximately 3-6 nm thick) s-Ge 2.2%, biaxial compression) epitaxially grown on a relaxed Si <sub xmlns:xlink="http://www.w3.org/1999/xlink">0.56</sub> Ge xmlns:xlink="http://www.w3.org/1999/xlink">0.44</sub> virtual substrate....
Current studies investigating properties of nanoparticle-reinforced polymers have shown that nanocomposites often exhibit improved compared to neat polymers. However, over two decades research, using both experimental and modeling analyses, has not fully elucidated the mechanistic underpinnings behind these enhancements. Moreover, few focused on developing an understanding among or more polymer affected by incorporation nanomaterials. In our study, we investigated elastic thermal...