|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Frontiers in Advanced Functional Thin Films and Nanostructured Materials
||Engineering Elastic Strain Gradients to Tune the Electrical Properties of Semiconductors for Thermoelectric Applications
||Eric Yao, Gyuseok Kim, Brian Piccione, Jungho Shin, Daniel Gianola
|On-Site Speaker (Planned)
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.
||Planned: Supplemental Proceedings volume