NDLI: Coupled Quantum-Scattering Madeling of Thermoelectric Properties of Si/Ge/Si Quantum Well Structures

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Bulusu, A. Walker, D. G.
Copyright Year	2006
Abstract	Confined structures presumably offer enhanced performance of thermoelectric devices. 1) Interfaces and boundaries create scattering sites for phonons, which reduces the thermal conductivity. 2) Reduced dimensionality increases the local density of states near the Fermi level, which increases the Seebeck coefficient. From these two phenomena, the net effect should be an increase in ZT, the performance parameter used to evaluate different materials and structures. These effects have been measured and modeled, but none of the models attempts to quantify the electron-phonon coupled effects particularly in the regime where quantum and scattering influences are found. Using the non-equilibrium Green's function (NEGF) approach, quantum wells composed of Si and Ge are studied and the important physics isolated. Results show a competing effect between the decrease in the electrical conductivity due to scattering with the increase in electrical conductivity with doping, leading to 77% decrease in the value of the power factor for the case of electron-optical phonon scattering.
Sponsorship	Heat Transfer Division
Starting Page	267
Ending Page	273
Page Count	7
File Format	PDF
ISBN	0791847861
DOI	10.1115/IMECE2006-15274
e-ISBN	0791837904
Volume Number	Heat Transfer, Volume 3
Conference Proceedings	ASME 2006 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2006-11-05
Publisher Place	Chicago, Illinois, USA
Access Restriction	Subscribed
Subject Keyword	Radiation scattering Electrical conductivity Scattering (physics) Quantum wells Equilibrium (physics) Phonons Thermoelectric devices Density Physics Fermi level Electromagnetic scattering Thermal conductivity Electrons
Content Type	Text
Resource Type	Article

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