Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Solar driven water splitting is a promising energy storage technology for the production of sustainable hydrogen. In this study we present different silicon based integrated devices for photoelectrochemical water splitting, which provide enough photovoltage to drive the reaction without an external bias. Thin films of titanium dioxide, prepared by atomic layer deposition (ALD), are applied as a surface passivation and corrosion protection. The interfaces between the multi-junction cells and the protective coating were optimized individually by etching techniques and finding optimal parameters for the ALD process. The energy band alignment was studied by X-ray photoelectron spectroscopy (XPS) and the thickness of the titanium dioxide films were determined by ellipsometry. To reduce the overpotential for the hydrogen evolution reaction (HER) platinum particles were deposited electrochemically. In a next step the prepared systems were tested in a three-electrode arrangement under AM 1.5 illumination in 0.1 M KOH. After stability measurements the devices were studied again by XPS, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In final tests the efficiency and stability of the prepared devices were tested in a two-electrode arrangement in dependence of the pH value with an iridium-ruthenium oxide counter electrode. For the tandem-junction device solar to hydrogen efficiencies (STH) up to 1.8 % were reached, and the triple-junction device showed a maximum efficiency of 4.4 %.
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