UNSPECIFIED (2003) Passivation and reconstruction-dependent electron accumulation at sulphur treated InAs(001) surfaces. Surface Science, 523 (1-2). pp. 179-188. ISSN 0039-6028

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Abstract

The effects of in situ sulphur passivation on the electronic properties of n-type InAs(0 0 1) have been studied using X-ray photoemission spectroscopy and high resolution electron energy loss spectroscopy coupled with space-charge layer calculations. Surfaces passivated by sulphur dosing followed by arsenic capping were annealed in vacuum to progressively remove the protective layers. For disordered surfaces with a sulphur coverage of almost 2 monolayers (ML), complex surface plasmon modes were observed due to strong electron accumulation at the surface, with downward band bending around 600 meV. For (2 x 1) reconstructed surfaces (sulphur coverage <1 ML), the band bending dropped to 325 meV. A 375 degreesC anneal was sufficient to remove all sulphur and regain a clean (4 x 1) indium-terminated surface with 200 meV downward band bending. We discuss the reconstruction-dependent surface accumulation and some aspects of 'electrical passivation' of surfaces. (C) 2002 Elsevier Science B.V. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QC Physics
Journal or Publication Title:	Surface Science
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0039-6028
Date:	10 January 2003
Volume:	523
Number:	1-2
Number of Pages:	10
Page Range:	pp. 179-188
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/10143

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