Changes in the surface topography and electronic structure of SrTiO3(110) single crystals heated under oxidizing and reducing conditions

Gunhold, A.; Gömann, Karsten; Beuermann, L.; Kempter, V.; Borchardt, Günter; Maus‐Friedrichs, W.

doi:10.1016/j.susc.2004.05.030

Cited by 20 publications

(14 citation statements)

References 11 publications

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“…Figure 7 shows MIES spectra of the band gap between the Fermi level and E B = 5 eV. The Fermi level is pinned to the conduction band, the gap width of about 3 eV corresponds to previous findings 21–25. The top spectrum shows the surface directly after sputtering.…”

Section: Resultsmentioning

confidence: 66%

“…This surface is slightly contaminated from residual gas components which are desorbed at a temperature of 560 K. After this smooth cleaning procedure, contribution from surface defects in the band gap appear around 0.9 eV below the Fermi level. These states in the band gap are well known oxygen defects which result in the occupation of surface Ti 3d orbitals 21–23, 31, 32…”

Section: Resultsmentioning

confidence: 99%

“…7 show, that defect states may be observed obviously in the band gap of sputtered SrTiO 3 (100) only with MIES. They correspond to Ti 3d states located just below the Fermi level, which has been observed for donor‐doped SrTiO 3 surfaces with MIES previously 21–23. Such defects are not observed before sputtering.…”

Section: Discussionmentioning

confidence: 99%

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The interaction of H₂O with Fe‐doped SrTiO₃(100) surfaces

Voigts

Argirusis

Maus‐Friedrichs

2010

Surface & Interface Analysis

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The interaction of H 2 O with 0.013 at.% Fe-doped SrTiO 3 (100) was investigated in situ with Metastable Induced Electron Spectroscopy (MIES), Ultraviolet Photoelectron Spectroscopy (UPS) and XPS at room temperature. Low Energy Electron Diffraction (LEED) was applied to gather information about the surface termination. To clear up the influence of surface defects, untreated and weakly sputtered SrTiO 3 surfaces were investigated. The sputtering results in the formation of oxygen-related defects in the top surface layer.The interaction of untreated SrTiO 3 surfaces with H 2 O is only weak. Small amounts of OH groups can be identified only with MIES due to its extreme surface sensitivity. Sputtered surfaces show a larger OH formation. Nondissociative H 2 O adsorption is not observed. We therefore conclude that the exposure of H 2 O to SrTiO 3 (100) results in the dissociation near surface defects only, resulting in the formation of surface hydroxyl groups.

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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

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The interaction of H₂O with Fe‐doped SrTiO₃(100) surfaces

Voigts

Argirusis

Maus‐Friedrichs

2010

Surface & Interface Analysis

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“…Sr surface segregation and growth of SrO x secondary phase on SrTiO 3 surfaces under oxidizing conditions have been also confirmed by many groups [407,[413][414][415][416][417][418]. The amount of the formed surface SrO x layers increases with the doping level of La or Nb in SrTiO 3 since the extrinsic donors can create more Sr vacancies and enhance Sr diffusion in the solids [413][414][415]. Rahmati et al also showed that the density of surface SrOrich islands depends on SrTiO 3 surface orientations and island density decreases in the sequence of (100), (110), and (111).…”

Section: Effect Of Srtiomentioning

confidence: 56%

“…Szot et al have observed a continuous accumulation of SrO x on SrTiO 3 (100) surfaces in the case of oxidizing conditions [411,412]. Sr surface segregation and growth of SrO x secondary phase on SrTiO 3 surfaces under oxidizing conditions have been also confirmed by many groups [407,[413][414][415][416][417][418]. The amount of the formed surface SrO x layers increases with the doping level of La or Nb in SrTiO 3 since the extrinsic donors can create more Sr vacancies and enhance Sr diffusion in the solids [413][414][415].…”

Section: Effect Of Srtiomentioning

confidence: 81%