Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Nanostructures, Nanostructuring and Nanosized Soft Matter

CPP 50.1: Talk

Friday, September 9, 2022, 12:30–12:45, H38

The effect of solvent vapor annealing on diblock copolymer templated mesoporous Si/Ge/C thin films — •Christian L. Weindl¹, Christian E. Fajman², Michael A. Giebel², Kerstin S. Wienhold¹, Shanshan Yin¹, Ting Tian¹, Christina Geiger¹, Lucas P. Kreuzer⁵, Matthias Schwartzkopf³, Stephan V. Roth^3,4, Thomas F. Fässler², and Peter Müller-Buschbaum^1,5 — ¹TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — ²TU München, LS Anorganische Chemie mit Schwerpunkt Neue Materialien, Chemie-Department, 85748 Garching — ³DESY, 22607 Hamburg — ⁴Royal Institute of Technology KTH, 100 44 Stockholm — ⁵MLZ, TU München, 85748 Garching

The latest research has revealed promising results for silicon (Si) and germanium (Ge) as anode materials for lithium-ion batteries. These two group 14 semiconductors are considered auspicious additives in graphite anodes due to their high specific capacity (Si) and electron mobility (Ge). This study aims to synthesize a mesoporous Si/Ge/C structure by using a wet chemical sol-gel approach with the structure-directing amphiphilic diblock copolymer PS-b-PEO and the Zintl cluster K₁₂Si_xGe_17−x. Furthermore, we investigate the structural changes on the spin-coated thin films upon exposure to a saturated toluene/butanol atmosphere. For morphlolgical analysis, scanning electron microscopy will be combined with grazing-incidence small-angle x-ray scattering (GISAXS). Moreover, energy-dispersive X-ray spectroscopy, Raman spectroscopy and powder X-ray diffraction are used for further elemental and crystalline phase analysis.