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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Frontiers in Advanced Functional Thin Films and Nanostructured Materials
Presentation Title Engineering Elastic Strain Gradients to Tune the Electrical Properties of Semiconductors for Thermoelectric Applications
Author(s) Eric Yao, Gyuseok Kim, Brian Piccione, Jungho Shin, Daniel Gianola
On-Site Speaker (Planned) Eric Yao
Abstract Scope Conventional enhancement of thermoelectric materials comes from modifying chemistry or microstructure. Elastic strain engineering offers an alternative pathway with the potential for material-agnostic increases in performance and tunability by modulating lattice spacings and symmetries. By working at length scales where the low elastic strain limits of bulk materials can be avoided, promising candidate materials can achieve significant elastic strain. Further, strain gradients, rather than uniform strain are promising means to lift symmetry restrictions on functional properties. This presentation will introduce strain engineering in the context of thermoelectric materials, fabrication of micro-meshed silicon thermoelectric tensile coupons incorporating different strain gradient geometries, measurement of electrical properties during in-situ deformation, and locally measured Seebeck coefficients to link properties with locally induced strains. Understanding of how transport properties are altered in the presence of strain gradients show promise to further increases of figures of merit in already high-performance thermoelectrics.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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Control of Nucleation of 3C-SiC Utilizing Screw Dislocations in 6H-SiC
Defects in Nanoscale Transitional Metal Di-chalcogenide Semiconducting Layers
Diamond Epitaxy for High Power and High Temperature Electronics
Discovery of Ferromagnetism and High-temperature Superconductivity in Q-carbon
Effect of Geometrical Defects on Thermal and Mechanical Properties of Metal-coated Multi-walled Carbon Nanotubes
Effect of Process Parameters on Phase Stability and Metal-insulator Transition of Vanadium Dioxide (VO2) Thin Films by Pulsed Laser Deposition (PLD)
Engineering Elastic Strain Gradients to Tune the Electrical Properties of Semiconductors for Thermoelectric Applications
Epitaxial Growth of Advanced Ceramic and Metal Films
Functionalization of Transparent Oxide Thin Films Using Silicon Doped Nanoparticles
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Graphene Film Nano Geometry Control for Advanced Functional Properties
Graphitization and Growth of Free-standing Nanocrystalline Graphene Using In Situ Transmission Electron Microscopy
High-temperature Carbon-based Superconductors: B-doped Q-carbon
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Hydrogen Plasma Annealing of E-Beam Evaporated SiO2 Tunnel Barriers
Kinetic Modeling of the Structural Transition in VO2 Thin Films
Magnetic Anisotropy in Ni/VO2 Heterostructures
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Physiochemical and Antioxidant Properites of CNPs Modulated by Anions of the Precursor
Point Defect Energetics at Oxide Heterointerfaces
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Q-carbon Tribological Coatings on WC and Tool Steel
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Structures and Mechanical Behavior of Metal-metal Nitride Nanolayered Films
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