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Scientific Highlights

Scientific Highlights

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Datum
7. April 2020
Lawley et al

Examining the surface evolution of LaTiOxNy an oxynitride solar water splitting photocatalyst

LaTiOxNy oxynitride thin films are employed to study the surface modifications at the solid- liquid interface that occur during photoelectrocatalytic water splitting. Neutron reflectometry and grazing incidence x-ray absorption spectroscopy were utilised to distinguish between the surface and bulk signals, with a surface sensitivity of 3 nm.

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6. Januar 2020
OER/LOER and dissolution/ redeposition mechanism

Energy Conversion Processes with Perovskite-type Materials

Mixed oxides derived from the perovskite structure by combination of A- and B-site elements and by partial substitution of oxygen provide an immense playground of physico-chemical properties. Here, we give an account of our own research conducted at the Paul Scherrer Institute on perovskite-type oxides and oxynitrides used in electrochemical, photo(electro)chemical and catalytic processes aimed at facing energy relevant issues.

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6. Januar 2020
Oxygen diffusion

Oxygen diffusion in oxide thin films grown on SrTiO3

SrTiO3 thin films were grown on 18O-exchanged SrTiO3 single crystalline substrates by pulsed-laser deposition, rf sputtering, and oxide molecular-beam epitaxy to study their oxygen diffusion depth profiles using secondary ion mass spectrometry and elastic recoil detection analysis depth profiling. The oxygen depth profiling shows that SrTiO3 films prepared with the three different deposition techniques will take oxygen from the substrate, even at room temperature. This confirms that the substrate is one possible oxygen source for the growth of oxide thin films independent of the physical vapor deposition technique employed. It was also found that a reactive oxygen environment changes the oxygen composition of the substrate during the growth of a film and partly replaces 18O with 16O up to a depth of several tens of nm. These findings imply that SrTiO3 and therefore other ion conducting oxide substrates, which are commonly used as platforms for thin film growth, can be considered capricious in nature with respect to oxygen chemistry and lattice constants.

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Thin Films and Interfaces Group
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Professor Dr. Dr. h.c. Thomas Lippert
Head of Group
OFLB/U110
tel: +41 56 310 4076
fax: +41 56 310 2688
thomas.lippert@psi.ch

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