Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 34: Functional semiconductors for renewable energy solutions II (joint session HL/CPP)

HL 34.5: Talk

Tuesday, March 17, 2020, 15:00–15:15, POT 151

Thermoelectric transport properties of mesoporous silicon and mesoporous silicon - poly(3,4-ethylenedioxythiophene) hybrids — •Haider Haseeb^1,2, Danny Kojda¹, Klaus Habicht^1,2, 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.