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HL: Fachverband Halbleiterphysik
HL 34: Functional semiconductors for renewable energy solutions II (joint session HL/CPP)
HL 34.5: Vortrag
Dienstag, 17. März 2020, 15:00–15:15, POT 151
Thermoelectric transport properties of mesoporous silicon and mesoporous silicon - poly(3,4-ethylenedioxythiophene) hybrids — •Haider Haseeb1,2, Danny Kojda1, Klaus Habicht1,2, and Tommy Hofmann1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie Gmbh, Hahn-Meitner-Platz 1, 14109 Berlin — 2Universität Potsdam - Institut für Physik, Karl-Liebknecht-Straße 32, 14476 Potsdam
This presentation studies thermoelectric transport in mesoporous silicon (pSi) and mesoporous silicon-poly(3,4-ethylenedioxythiophene) (pSi-PEDOT) hybrids. We comprehensively explain electrochemical etching of pSi and infiltration of PEDOT based polymer blends (PEDOT:PSS, PEDOT:Tos) into pSi by dip- and drop-casting and vapor-phase polymerization. Surface sensitive SEM and volume sensitive nitrogen sorption isotherms probe morphological features such as pore size distributions, specific surfaces and porosities of as-etched pSi and pSi-PEDOT hybrids. Macroscopic transport measurements determine electrical and thermal conductivity, Hall mobility, charge carrier concentration and Seebeck coefficient of pSi, PEDOT, and pSi-PEDOT hybrids. We compare the temperature dependent thermoelectric performance of pSi-PEDOT hybrids with the properties of the corresponding inorganic and organic bulk systems. Our quantitative data analysis of charge and heat transport focuses on effective medium models.