Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 50: HL Poster IV

HL 50.56: Poster

Donnerstag, 15. März 2018, 19:00–21:00, Poster B

Organic-Inorganic Hybrid Thermoelectrics based on Mesoporous Silicon and PEDOT:PSS — •Haider Haseeb, Tommy Hofmann, Danny Kojda, and Klaus Habicht — Helmholtz-Zentrum Berlin für Materialien und Energie (HZB), Berlin, Germany

This contribution presents mesoporous silicon and derived hybrid systems that incorporate conducting PEDOT:PSS into the vacant pore space as thermoelectric materials of interest. First, the synthesis of mesoporous silicon by means of electrochemical etching is explained. Grown samples are characterized in microscopic SEM studies as well as with gas adsorption isotherms to reveal morphological features that are pore size distributions, specific surfaces and porosities. Second, the impact of porousification on the thermoelectric properties is revealed and discussed. Macroscopic transport measurements that probe electrical and thermal conductivity, Hall mobility, charge carrier concentration and Seebeck coefficients allow to compare the thermoelectric performance of mesoporous silicon with the properties of the corresponding bulk system. In the third and final part of the poster, we show the infiltration of PEDOT:PSS into porous silicon as a way to form organic-inorganic hybrids. Their preliminary thermoelectric characterization and microscopic analysis conclude our presentation and allow an outlook on future material improvements.