Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.276
Publication date: 18th July 2019
The conversion of thermal energy to electricity and vice versa by means of solid state thermoelectric devices is appealing for a large number of applications. However, its cost-effectiveness is hindered by the relatively high production cost and low efficiency of thermoelectric devices and more specifically of current thermoelectric materials. To overcome present challenges and being able to deploy thermoelectric technology in its wide market range, novel and complex materials with significantly improved performance need to be designed (identified) and engineered (optimized). Current conventional thermoelectric material production technologies are based on purely inorganic compound semiconductors produced by solid-state synthesis of ingots. This synthetic method lacks the level of control required, and alternative strategies need to be developed with superb control over structural and chemical parameters at multiple length scales. One such alternative technologies is the bottom-up engineering of materials by solution processing approaches. Composite materials with precisely tuned electronic properties can be produced by the assembly and consolidation of colloidal nanocrystals.[1] This methodology is facile, scalable, potentially low cost, and extremely versatile. Beyond the synthetic control over crystal domain size, shape, crystal phase, and composition, solution-processed nanocrystals permit exquisite surface engineering. Herein, we present three different strategies that allow to optimize the transport properties at different material production level (TOC Graphic): i) nanoparticle synthesis;[2] ii) nanoparticle surface tuning;[3], [4] and iii) nanoparticle consolidation.[5] These results demonstrate the unique possibilities of the nanocrystal bottom-assembly to produce high performance nanocomposites.
This work was financially supported by the European Union (EU) via FP7 ERC Starting Grant 2012 (Project NANOSOLID, GA No. 306733). M.I. was supported by IST Austria, and by ETH Zurich via ETH career seed grant (SEED-18 16-2). Y.L. acknowledges funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 754411. IREC acknowledges funding from Generalitat de Catalunya (2014SGR1638). J.A. acknowledge funding from Generalitat de Catalunya 2017 SGR 327 and the Spanish MINECO coordinated projects between IREC and ICN2 ENE2017-85087-C3. ICN2 acknowledges support from the Severo Ochoa Program (MINECO, Grant SEV-2017-0706) and is funded by the CERCA Programme/Generalitat de Catalunya.
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