
Low Temperature Enhancement of the Thermoelectric Seebeck Coefficient in Semiconductor Nanoribbons
09 Nov 2016   Contributor(s):: Kommini Adithya, Zlatan Aksamija
IWCE 2015 Presentation. We propose a novel approach to achieving a narrow windowshaped TDF through a combination of a steplike 2dimensional densityofstates (DOS) and inelastic optical phonon scattering. A shift in the onset of scattering with respect to the steplike DOS creates a TDF which...

Practice Your Scales!
Thermal and Energy Nanomaterials for Fast Processes
17 Aug 2016   Contributor(s):: Timothy S Fisher

PHYS 620 Lecture 8: Phonons
12 Apr 2013   Contributor(s):: Roberto Merlin

ECE 656 Lecture 26: Phonon Scattering III
22 Nov 2011   Contributor(s):: Mark Lundstrom
Outline:ReviewExamplePOP and IV scatteringScattering in common semiconductorsElectronelectron scatteringSummary

ECE 656 Lecture 25: Phonon Scattering II
22 Nov 2011   Contributor(s):: Mark Lundstrom
Outline:Reviewphononselectronphonon couplingEnergymomentum conservationMathematical formulationExampleSummary

ECE 656 Lecture 24: Phonon Scattering I
09 Nov 2011   Contributor(s):: Mark Lundstrom
This lecture should be viewed in the 2009 teaching ECE 656 Lecture 23: Phonon Scattering I

Lecture 9: Introduction to Phonon Transport
17 Aug 2011   Contributor(s):: Mark Lundstrom
This lecture is an introduction to phonon transport. Key similarities and differences between electron and phonon transport are discussed.

Tutorial 2: Thermal Transport Across Interfaces  Electrons
16 Aug 2011   Contributor(s):: Timothy S Fisher
Outline:Thermal boundary resistanceElectronic transportReal interfaces and measurementsCarbon nanotube interfaces

Tutorial 1: Thermal Transport Across Interfaces  Phonons
15 Aug 2011   Contributor(s):: Timothy S Fisher
Outline:Lattice vibrations and phononsThe vibrating stringInterfaces between dissimilar strings: acousticmismatchDiscrete masses and the vibrational eigenspectrumGeneral thermal transport theory

Tutorial 2: A BottomUp View of Heat Transfer in Nanomaterials
23 Mar 2011   Contributor(s):: Timothy S Fisher
This lecture provides a theoretical development of the transport of thermal energy by conduction in nanomaterials. The physical nature of energy transport by two carriers—electrons and phononswill be explored from basic principles using a common Landauer framework. Issues including the quantum...

Limits of Thermal Processes and their Implications on Efficient Energy Utilization
27 Oct 2010   Contributor(s):: Arunava Majumdar
About 90 percent of the world’s energy use involves thermal processes – thermal engines to generate mechanical power; heating and cooling in buildings; heating involved in manufacturing of steel, cement, glass, petrochemicals etc. To identify opportunities for improving current technologies or...

Thermoelectric effects in semiconductor nanostructures: Role of electron and lattice properties
06 Oct 2010   Contributor(s):: Abhijeet Paul, Gerhard Klimeck
This presentation covers some aspects of present development in the field of thermoelectricity and focuses particularly on the silicon nanowires as potential thermoelectric materials. The electronic and phonon dispersions are calculated and used for the calculation of thermoelectric properties in...

Tutorial 3a: Materials Simulation by FirstPrinciples Density Functional Theory I
14 Sep 2010   Contributor(s):: Umesh V. Waghmare
This lecture provides an introduction to firstprinciples density functional theory based methods for simulation of materials, with a focus on determination of interatomic force constants and vibrational spectra of nanostructures and extended periodic materials.Outline:Phonons, soft...

Ripples and Warping of Graphene: A Theoretical Study
08 Jun 2010   Contributor(s):: Umesh V. Waghmare
We use firstprinciples density functional theory based analysis to understand formation of ripples in graphene and related 2D materials. For an infinite graphene, we show that ripples are linked with a low energy branch of phonons that exhibits quadratic dispersion at long wavelengths. Many...

ECE 656 Lecture 25: Phonon Scattering III
13 Nov 2009   Contributor(s):: Mark Lundstrom
Outline:ReviewPOP and IV scatteringScattering in common semiconductorsElectronelectron scatteringSummary

ECE 656 Lecture 24: Phonon Scattering II
13 Nov 2009   Contributor(s):: Mark Lundstrom
Outline:Review Energymomentum conservationMathematical formulationExampleSummary

ECE 656 Lecture 23: Phonon Scattering I
10 Nov 2009   Contributor(s):: Mark Lundstrom
Outline:About phononsElectronphonon couplingEnergymomentum conservationSummary

Illinois ECE 598EP Lecture 8  Hot Chips: Thermal Conductivity of Solids
24 Jun 2009   Contributor(s):: Eric Pop, Omar N Sobh
Thermal Conductivity of SolidsTopics: Kinetic Theory of Energy Transport Simple Kinetic Theory Assumptions Phonon MFP and Scattering Time Silicon Film Thermal Conductivity Silicon Nanowire Thermal Conductivity Isotope Scattering Electron Thermal Conductivity Thermal Conductivity of Cu and Al

Is dual gate device structure better from a thermal perspective?
01 Sep 2008   Contributor(s):: Dragica Vasileska, Stephen M. Goodnick
This presentation illustrates several points. First, it is shown that in nanoscale devices there is less degradation due to heating effects due to nonstationary nature of the carrier transport (velocity overshoot) in the device, which, in turn, makes less probable the interaction with phonons....