merit08_singh

merit08_singh - Thermoelectric Materials by Design:...

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1 Managed by UT-Battelle for the Department of Energy Thermoelectric Materials by Design: Computational Theory and Structure * David J. Singh Materials Science and Technology Division Oak Ridge National Laboratory February 18, 2008 * This presentation does not contain any proprietary of confidential information Active Cooling PN Heat Rejection I Refrigeration Heat Source Heat Sink I Power Generation
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2 Managed by UT-Battelle for the Department of Energy PURPOSE OF WORK Find promising new thermoelectric compositions for waste heat recovery in vehicles (waste heat Æ electric power). Focus on potentially inexpensive materials. Use science based approach especially materials design strategies employing first principles calculations. Primary emphasis is materials with high figure of merit at temperatures relevant for waste heat recovery. ZT = σ S 2 T/ κ Other potential benefit: Improved materials for automotive climate control (All electric distributed A/C).
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3 Managed by UT-Battelle for the Department of Energy BARRIERS * Need higher ZT materials at operating temperature Target is temperature averaged ZT =2, with Δ T ~400 +/- 50 C, which could yield 5% fuel efficiency improvement. Both n -type and p -type materials. Must be cost effective. Target is $1/W but lower is desired ($0.20/W). Must be manufacturable and durable (mechanical properties / stability). * “Science-Based Approach to Development of Thermoelectric Materials for Transportation Applications: A Research Roadmap”, Office of FreedomCar and Vehicle Technologies, DOE (2007).
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4 Managed by UT-Battelle for the Department of Energy DOPING DEPENDENCE OF THERMOELECTRIC PROPERTIES Ioffe (1957) Note strong doping dependence. Can explore entire doping range with theory reducing the need for extensive synthesis & characterization to find optimal composition.
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5 Managed by UT-Battelle for the Department of Energy APPROACH
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This note was uploaded on 05/21/2010 for the course MS Thermoelec taught by Professor Snyder during the Spring '10 term at Caltech.

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merit08_singh - Thermoelectric Materials by Design:...

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