Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 45: HL Posters III

HL 45.26: Poster

Donnerstag, 4. April 2019, 18:30–21:00, Poster E

Mesoporous silicon filled with functionalized molecules as novel thermoelectric hybrids — •Natalia Gostkowska, Klaus Habicht, and Tommy Hofmann — Helmholtz-Zentrum Berlin für Materialien und Energie Hahn-Meitner-Platz 1 14109 Berlin

This contribution presents objectives and first results of the DFG project 'Hybrid thermoelectric materials based on porous silicon: Linking macroscopic transport phenomena to microscopic structure and elementary excitations'. The approach to associate mesoporous semiconductors and functionalized molecules in novel thermoelectric materials is thoroughly motivated. We discuss in detail the synthesis of the mesoporous silicon by means of electrochemical etching in a newly designed etching cell. Nitrogen sorption isotherms and scanning electron microscopy studies reveal comprehensively the morphology of the synthesized porous membranes. To complete the thermoelectric characterization the Hall effect, Seebeck coefficient, thermal conductivity and electrical conductivity measurements are performed to elucidate the interplay of morphology and thermoelectric transport. The presentation finally discusses the P3HT, PEDOT:PSS, polypyrrole and other functionalized molecules as potential candidates for the envisioned hybrids and provides an outlook on synthesis routes.

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