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DTSTAMP:20260406T000454Z
UID:1649754000@ist.ac.at
DTSTART:20220412T110000
DTEND:20220412T120000
DESCRIPTION:Speaker: Jeffrey Snyder\nhosted by Maria Ibáñez\nAbstract: St
 rategies for Engineering Complex Thermoelectric MaterialsThermoelectric (T
 E) energy conversion is widely studied for its potential to produce electr
 icity from waste heat or provide cooling without the use of harmful refrig
 erants. There are a number of common strategies used to engineer higher th
 ermoelectric figure of merit\, zT\, in complex materials. Because the prop
 erties that make up zT are all interrelated\, the improvement of thermoele
 ctric materials is best guided by the thermoelectric Quality Factor B\, pr
 oportional to the weighted mobility\, μW\, and lattice thermal conductivi
 ty\, κL\, as B ~ μW/κL. The weighted mobility is a better measure of th
 e relevant electronic properties than the power factor because it is a con
 stant material property. Strategies to reduce κL\, must not significantly
  reduce μW for there to be a net improvement in B and therefore zT.The we
 ighted mobility\, μW\, is related to the mobility measured by the Hall ef
 fect and density of electronic states measured by the Seebeck effective ma
 ss m*. This can be used to identify high band degeneracy and band converge
 nce which is known to lead to high B and zT with examples of zT > 1 found 
 in PbTe\, GeTe\, and MgSb.In this context\, we review the common strategie
 s of nanostructuring\, band engineering\, doping and alloying\, using the 
 more recently specified strategies of full spectrum phonon scattering and 
 phonon softening\, increasing band convergence and reducing inertial effec
 tive mass\; while at the same time\, phase boundary mapping to engineer do
 pants and avoiding excessive grain boundary electrical resistance. Finally
  the method to easily calculate device ZT will be introduced to accurately
  compare the maximum efficiency of a new material with others in a thermoe
 lectric device.
LOCATION:Big Seminar Room B - Sunstone Building\, ISTA
ORGANIZER:
SUMMARY:Jeffrey Snyder: Strategies for Engineering Complex Thermoelectric M
 aterials
URL:https://talks-calendar.ista.ac.at/events/3581
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