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Superior electronic passivation of n-GaP(100) surface using alcoholic as compared to aqueous ammonium sulfide solution: Wet processing studied with synchrotron photoelectron spectroscopy

Lebedev, Mikhail V. and 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), WILEY-VCH Verlag GmbH & Co. KGaA, pp. 2005-2012, ISSN 18626300,
[Online-Edition: http://dx.doi.org/10.1002/pssa.201330402],
[Article]

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.

Item Type: Article
Erschienen: 2014
Creators: Lebedev, Mikhail V. and Mayer, Thomas
Title: Superior electronic passivation of n-GaP(100) surface using alcoholic as compared to aqueous ammonium sulfide solution: Wet processing studied with synchrotron photoelectron spectroscopy
Language: English
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.

Journal or Publication Title: physica status solidi (a)
Volume: 211
Number: 9
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA
Uncontrolled Keywords: ammonium sulfide, electronic passivation, GaP, photoelectron spectroscopy, photovoltage, surface recombination
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 26 Feb 2015 10:08
Official URL: http://dx.doi.org/10.1002/pssa.201330402
Identification Number: doi:10.1002/pssa.201330402
Funders: This work was supported in part by Russian Foundation for Basic Research (project 13-02-00540a).
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