Superior electronic passivation of n‐GaP(100) surface using alcoholic as compared to aqueous ammonium sulfide solution: Wet processing studied with synchrotron photoelectron spectroscopy. Issue 9 (12th February 2014)

• Record Type: Journal Article
• Authors: Lebedev, Mikhail V.; Mayer, Thomas
• Is Part Of: Physica status solidi. Volume 211:Issue 9(2014:Sep.)
• Page Start: 2005
• Page End: 2012
• Publication Date: 2014-02-12
• Subjects: Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201330402
• Languages: English
• ISSNs: 1862-6300

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="pssa201330402-sec-0001" sec-type="section"> <p>The chemical composition and the electronic properties of the n‐GaP(100) surface treated with ammonium sulfide dissolved in water <italic>versus</italic> 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 <italic>versus</italic> 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.</p> </sec> </abstract>