Silicon-based nanocomposites for thermoelectric application
| Autor: | V. Kessler, Gabi Schierning, Benedikt Stoib, Martin Stutzmann, J. Stoetzel, Nils Petermann, Roland Schmechel, Tom Schneider, Martin S. Brandt, Joseph Hall, Dietrich E. Wolf, R. Chavez, Hartmut Wiggers, Sebastian Angst, Anton Greppmair |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Silicon chemistry.chemical_element 02 engineering and technology 01 natural sciences 0103 physical sciences Thermoelectric effect Materials Chemistry Electrical and Electronic Engineering 010302 applied physics Nanocomposite business.industry Doping Metallurgy Nanocrystalline silicon Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics Thermoelectric materials Nanocrystalline material Surfaces Coatings and Films Electronic Optical and Magnetic Materials Thermoelectric generator chemistry Optoelectronics 0210 nano-technology business |
| Zdroj: | physica status solidi (a). 213:497-514 |
| ISSN: | 1862-6300 |
| Popis: | Here we present the realization of efficient and sustainable silicon-based thermoelectric materials from nanoparticles. We employ a gas phase synthesis for the nanoparticles which is capable of producing doped silicon (Si) nanoparticles, doped alloy nanoparticles of silicon and germanium (Ge), SixGe1–x, and doped composites of Si nanoparticles with embedded metal silicide precipitation phases. Hence, the so-called “nanoparticle in alloy” approach, theoretically proposed in the literature, forms a guideline for the material development. For bulk samples, a current-activated pressure-assisted densification process of the nanoparticles was optimized in order to obtain the desired microstructure. For thin films, a laser annealing process was developed. Thermoelectric transport properties were characterized on nanocrystalline bulk samples and laser-sintered-thin films. Devices were produced from nanocrystalline bulk silicon in the form of p–n junction thermoelectric generators, and their electrical output data were measured up to hot side temperatures of 750 °C. In order to get a deeper insight into thermoelectric properties and structure forming processes, a 3D-Onsager network model was developed. This model was extended further to study the p–n junction thermoelectric generator and understand the fundamental working principle of this novel device architecture. Gas phase synthesis of composite nanoparticles; nanocrystalline bulk with optimized composite microstructure; laser-annealed thin film. |
| Databáze: | OpenAIRE |
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