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Spectroscopic interpretation for Na-induced phase transitions on Na/Si(1 1 1)3 × 1

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Volume
601
Issue
2
Identifiers
DOI: 10.1016/j.susc.2006.10.004
Keywords
  • Silicon
  • Na
  • Self-Assembly
  • One-Dimensional Structure
  • Surface Reconstruction
  • Photoemission Spectroscopy

Abstract

Abstract Na adsorption at room temperature causes the Na/Si(1 1 1)3 × 1 surface with Na coverage of 1/3 monolayer (ML) to transit into the Na/Si(1 1 1)6 × 1 surface at 1/2 ML and sequentially into the Na/Si(1 1 1)3 × 1 surface at 2/3 ML. The phase transition was studied by Si 2p core-level photoemission spectroscopy. The detailed line shape analysis of the Si 2p core-level spectrum of the Na/Si(1 1 1)3 × 1 surface (2/3 ML) is presented and compared to the Na/Si(1 1 1)3 × 1 surface (1/3 ML) which is composed of Si honeycomb chain-channel structures. This suggests that as additional Na atoms form atomic chains resulting in the Na/Si(1 1 1)3 × 1 surface (2/3 ML), the inner atoms of the Si honeycomb chain-channel structure is buckled due to the additional Na atoms.

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