STM study of the electronic structure of PTCDA on Ag/Si(111)-√3 x √3

被引：21

作者：

Zhang, H. M. ^{[1
]}

Gustafsson, J. B. ^{[1
]}

Johansson, L. S. O. ^{[1
]}

机构：

[1] Karlstad Univ, Dept Phys, SE-65188 Karlstad, Sweden

来源：

CHEMICAL PHYSICS LETTERS | 2010年 / 485卷 / 1-3期

基金：

瑞典研究理事会;

关键词：

ORGANIC-MOLECULES; EPITAXY; SURFACE; GROWTH; FILMS; DIANHYDRIDE; MULTILAYER; ADSORBATES; CRYSTALS; AG(110);

D O I：

10.1016/j.cplett.2009.11.070

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：

PTCDA molecules were evaporated onto the AG/Si(1 1 1)-root 3 x root 3 surface. Simple HOMO and LUMO models have been made to explain the STM images of the square and herringbone phases. The charge transfer from the substrate and the H-bonding between the molecules play crucial roles for the formation of these phases. We found that their electronic structures are strongly modified by the molecule-substrate and intermolecular interactions. As a result, the HOMO-LUMO gaps of the PTCDA films are different for different phases and thicknesses. The increase in the HOMO-LUMO gaps with film thicknesses is discussed based on the surface and the interface polarization effect. (C) 2009 Elsevier B. V. All rights reserved.

引用

页码：69 / 76

页数：8

共 30 条

[1] Molecular growth and sub-molecular resolution of a thin multilayer of PTCDA on Ag(110) observed by scanning tunneling microscopy [J].