TY  - JOUR
AU  - Cottre, Thorsten
AU  - Welter, Katharina
AU  - Ronge, Emanuel
AU  - Smirnov, Vladimir
AU  - Finger, Friedhelm
AU  - Jooss, Christian
AU  - Kaiser, Bernhard
AU  - Jaegermann, Wolfram
TI  - Integrated Devices for Photoelectrochemical Water Splitting Using Adapted Silicon Based Multi-Junction Solar Cells Protected by ALD TiO2 Coatings
JO  - Zeitschrift für physikalische Chemie
VL  - 234
IS  - 6
SN  - 2196-7156
CY  - Berlin
PB  - ˜Deœ Gruyter
M1  - FZJ-2020-02475
SP  - 1155–1169
PY  - 2020
AB  - 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 of the systems was studied by X-ray photoelectron spectroscopy (XPS). Electrochemically deposited platinum particles were used to reduce the HER overpotential. The prepared systems were tested in a three-electrode arrangement under AM 1.5 illumination in 0.1 M KOH. 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 a ruthenium-iridium 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%.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000542554000006
DO  - DOI:10.1515/zpch-2019-1483
UR  - https://juser.fz-juelich.de/record/877851
ER  -