Regensburg 2019 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 19: Thermoelectricity

HL 19.2: Talk

Tuesday, April 2, 2019, 11:45–12:00, H33

Synthesis of organic-inorganic hybrids based on mesoporous silicon and PEDOT:PSS — •Haider Haseeb, Klaus Habicht, and Tommy Hofmann — Helmholtz-Zentrum Berlin für Materialien und Energie (HZB), Berlin, Germany

This contribution thoroughly discusses synthesis routes to combine mesoporous silicon and the conductive polymer blend, polyethylendioxythiophene:polystyrenesulfonate (PEDOT:PSS) in novel organic-inorganic hybrid materials. The synthesis of self-supporting, mesoporous silicon membranes by means of electrochemical etching is described in detail. Post treatment in hydrogen peroxide and hydrofluoric acid subsequently proves to be a versatile approach to widen the average pore size from 8 nm in as-etched samples to 25 nm in post-treated samples. The increased pore size and fine-tuned wetting properties of diluted PEDOT:PSS solutions are crucial for liquid imbibition into the pore space and thus for the synthesis of the hybrids. Microscopic SEM studies and gas adsorption isotherms are invaluable tools to reveal morphological properties of the synthesized samples. They readily show changes in pore size distributions, specific surfaces and porosities upon chemical treatment. They also provide stringent proof for successful incorporation of PEDOT:PSS into mesoporous silicon. Our contribution discusses in an outlook - the synthesized samples in the context of novel organic-inorganic thermoelectric hybrids.