Lebedev, Mikhail V. ; Mayer, Thomas (2014)
Superior electronic passivation of n-GaP(100) surface using alcoholic as compared to aqueous ammonium sulfide solution: Wet processing studied with synchrotron photoelectron spectroscopy.
In: physica status solidi (a), 211 (9)
doi: 10.1002/pssa.201330402
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The chemical composition and the electronic properties of the n-GaP(100) surface treated with ammonium sulfide dissolved in water versus 2-propanol is investigated using synchrotron-radiation photoemission spectroscopy (SXPS). Chemical composition and electronic structure of the passivated surfaces vary in dependence of the solvent used. The valence band maximum and the core level binding energies of the sulfide layers measured in the most surface sensitive mode are found at 1.0 and 0.75–0.9 eV higher binding energies using 2-propanol versus aqueous solution. This flattening of bands actually is related to photovoltage induced by synchrotron radiation. The strong source induced photovoltage obtained after treatment with 2-propanol solution indicates a high quality surface as surface recombination is largely suppressed due to passivation of surface gap states. In addition the carbon contamination is reduced three times using alcoholic while it is increased by a factor of 1.4 with aqueous solution.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Lebedev, Mikhail V. ; Mayer, Thomas |
| Art des Eintrags: | Bibliographie |
| Titel: | Superior electronic passivation of n-GaP(100) surface using alcoholic as compared to aqueous ammonium sulfide solution: Wet processing studied with synchrotron photoelectron spectroscopy |
| Sprache: | Englisch |
| Publikationsjahr: | September 2014 |
| Verlag: | WILEY-VCH Verlag GmbH & Co. KGaA |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | physica status solidi (a) |
| Jahrgang/Volume einer Zeitschrift: | 211 |
| (Heft-)Nummer: | 9 |
| DOI: | 10.1002/pssa.201330402 |
| Kurzbeschreibung (Abstract): | The chemical composition and the electronic properties of the n-GaP(100) surface treated with ammonium sulfide dissolved in water versus 2-propanol is investigated using synchrotron-radiation photoemission spectroscopy (SXPS). Chemical composition and electronic structure of the passivated surfaces vary in dependence of the solvent used. The valence band maximum and the core level binding energies of the sulfide layers measured in the most surface sensitive mode are found at 1.0 and 0.75–0.9 eV higher binding energies using 2-propanol versus aqueous solution. This flattening of bands actually is related to photovoltage induced by synchrotron radiation. The strong source induced photovoltage obtained after treatment with 2-propanol solution indicates a high quality surface as surface recombination is largely suppressed due to passivation of surface gap states. In addition the carbon contamination is reduced three times using alcoholic while it is increased by a factor of 1.4 with aqueous solution. |
| Freie Schlagworte: | ammonium sulfide, electronic passivation, GaP, photoelectron spectroscopy, photovoltage, surface recombination |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 26 Feb 2015 10:08 |
| Letzte Änderung: | 26 Feb 2015 10:08 |
| PPN: | |
| Sponsoren: | This work was supported in part by Russian Foundation for Basic Research (project 13-02-00540a). |
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