Dresden 2014 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.65: Poster
Thursday, April 3, 2014, 15:00–19:00, P2
Charge Storage in β-FeSi2 Nanoparticles — •Jens Theis1, Sebastian Küpper1, Robert Bywalez2, Hartmut Wiggers2, and Axel Lorke1 — 1Fakultät für Physik and CENIDE, Universität Duisburg-Essen — 2Institut für Verbrennung und Gasdynamik and CENIDE, Universität Duisburg-Essen
The increasing use of mobile electronics creates a steady demand for new energy storages with very high capacitance. Here we report on the observation of a surprisingly high specific capacitance of β-FeSi2 nanoparticle layers.
Lateral, interdigitated capacitor structures were fabricated on thermally grown silicon dioxide and covered by FeSi2 particles by drop or spin casting. The FeSi2-nanoparticles, with sizes in the range of 10-30 nm, were fabricated by gas phase synthesis in a hot wall reactor. Compared to the bare electrodes, the nanoparticle-coated samples exhibit a 3-4 orders of magnitude increased capacitance. Time-resolved current voltage measurements show that for short times (seconds to minutes), the material is capable of storing up to 1 As/g at voltages of around 1 V. The devices are robust and exhibit long term stability under ambient conditions. The specific capacitance is highest for a relative humidity of 95%, while for a relative humidity below 40% the capacitance is almost indistinguishable from a nanoparticle-free reference sample.
The devices work without the need of a fluid phase, the charge storing material is abundant and cost effective, and the sample design is easy to fabricate.