On the spatially resolved electronic structure of polycrystalline WO3 films investigated with scanning tunneling spectroscopy

被引：24

作者：

Ottaviano, L

Lozzi, L

Passacantando, M

Santucci, S

机构：

[1] INFM, Unita Aquila, I-67010 Coppito, Italy

[2] Univ Aquila, Dipartimento Fis, I-67010 Coppito, Italy

来源：

SURFACE SCIENCE | 2001年 / 475卷 / 1-3期

关键词：

scanning tunneling microscopy; scanning tunneling spectroscopies; electrical transport (conductivity; resistivity; mobility; etc.); surface structure; morphology; roughness; and topography; tungsten oxide; polycrystalline thin films; grain boundaries;

D O I：

10.1016/S0039-6028(00)01075-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electronic structure of polycrystalline monoclinic WO3 was been investigated by means of scanning tunneling spectroscopy in ultrahigh vacuum. Current image tunneling spectroscopy maps show a clear and systematic increase of the conductance of the surface at the WO3 crystallite boundaries, with a corresponding decrease of the bandwidth. This effect is assigned to the occurrence of sigma bonded electronic states lying deep in the bulk band gap, and due to pairing of reduced W ions at intersection planes between adjacent crystallites. Significant presence of pi bonding states at the Fermi level has been also detected at these crystallites boundaries. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：73 / 82

页数：10

共 25 条

[11] Observation of reduced (1x1) terraces on WO3(001) surfaces using scanning tunnelling microscopy [J].