Journal Article

FZJ-2018-03439

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png UV radiation enhanced oxygen vacancy formation caused by the PLD plasma plume

Hensling, F. (Corresponding author)FZJ* ; Keeble, D. J. ; Zhu, J. ; Brose, S. ; Xu, C. ; Gunkel, F.FZJ* ; Danylyuk, S. ; Nonnenmann, S. S. ; Egger, W. ; Dittmann, R.FZJ*

2018
Nature Publishing Group London

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Please use a persistent id in citations: http://hdl.handle.net/2128/18884  doi:10.1038/s41598-018-27207-5

Abstract: Pulsed Laser Deposition is a commonly used non-equilibrium physical deposition technique for the growth of complex oxide thin films. A wide range of parameters is known to influence the properties of the used samples and thin films, especially the oxygen-vacancy concentration. One parameter has up to this point been neglected due to the challenges of separating its influence from the influence of the impinging species during growth: the UV-radiation of the plasma plume. We here present experiments enabled by a specially designed holder to allow a separation of these two influences. The influence of the UV-irradiation during pulsed laser deposition on the formation of oxygen-vacancies is investigated for the perovskite model material SrTiO3. The carrier concentration of UV-irradiated samples is nearly constant with depth and time. By contrast samples not exposed to the radiation of the plume show a depth dependence and a decrease in concentration over time. We reveal an increase in Ti-vacancy–oxygen-vacancy-complexes for UV irradiated samples, consistent with the different carrier concentrations. We find a UV enhanced oxygen-vacancy incorporation rate as responsible mechanism. We provide a complete picture of another influence parameter to be considered during pulsed laser depositions and unravel the mechanism behind persistent-photo-conductivity in SrTiO3.

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Contributing Institute(s):

1. Elektronische Materialien (PGI-7)
2. JARA-FIT (JARA-FIT)

Research Program(s):

1. 521 - Controlling Electron Charge-Based Phenomena (POF3-521) (POF3-521)

Appears in the scientific report 2018

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