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Meeting Materials Science & Technology 2019
Symposium Nanotechnology for Energy, Environment, Electronics, Healthcare and Industry
Presentation Title Elucidating the Power of Nanoinclusion and Porous Site Scattering Mechanisms in Enhancing Thermoelectric ZT
Author(s) Seyed Aria Hosseini, Jackson Harter, Devin Coleman, Lorenzo Mangolini, Todd Palmer, Alex Greaney
On-Site Speaker (Planned) Seyed Aria Hosseini
Abstract Scope Researchers have recently developed processes for synthesizing monolithic Si with improved thermoelectric figure-of-merit, ZT. These materials obtain higher ZT through a finely controlled array of either nanoscale voids or secondary phase inclusions. In this work we elucidate the role these particles or pores play in two processes to increase ZT: (1) scattering of phonons to reduce thermal conductivity, and (2) energy selective scattering of electrons to increase the seebeck coefficient. Fermi’s golden rule is used to compute electron scattering interactions with inclusions or pores. There scattering rates are combined with electron-phonon and electron-impurity scattering rates using Mathessen’s method. The results are used to predict electrical properties of the Sl with different volume fraction of nanoparticles/pores. Boltzmann transport simulations are used to predict the collective effect of the scattering mechanisms on thermal conductivity of different silicon samples. Together, these models provide guidance for engineering new high ZT materials.
Proceedings Inclusion? Planned: At-meeting proceedings

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