Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Photoelectrochemical water splitting promises a way to produce and store sustainable energy in form of hydrogen. Next to efficiency the stability of such a device is essential for commercial use. We study the stability and degradation pathways of an integrated device design, consisting of silicon based multi-junction solar cells which are protected and passivated by a thin film of titanium dioxide grown with Atomic Layer Deposition (ALD). As a catalyst platinum nanoparticles were deposited on top. The devices were tested under AM 1.5 illumination in a three and two electrode arrangement. For the efficiency and stability measurements an iridium-ruthenium oxide counter electrode was used. Changes in the device surface and platinum particle morphology were analysed with Scanning Electron Microscopy (SEM) from different prepared devices. The shift in size of the platinum particles due to electrochemical operation was additionally examined on a dark reference sample and the results then were compared with the integrated devices. The solar cell degrade inhomogeneously, where at certain areas hole like structures in various sizes and densities are forming. These holes were more closely investigated with Transmission Electron Microscopy (TEM) and Energy Dispersive X-Ray Spectroscopy (EDX). We found first evidence that the holes in the TiO2 protection layer are nucleating at chemical inhomogeneities.
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