Chemical bonding of PTCDA on Ag surfaces and the formation of interface states

被引：246

作者：

Zou, Y ^{[1
]}

Kilian, L ^{[1
]}

Schöll, A ^{[1
]}

Schmidt, T ^{[1
]}

Fink, R ^{[1
]}

Umbach, E ^{[1
]}

机构：

[1] Univ Wurzburg, Phys Inst, D-97074 Wurzburg, Germany

来源：

SURFACE SCIENCE | 2006年 / 600卷 / 06期

关键词：

PTCDA; Ag(111); Ag(110); interface; bonding; chemisorption; LEED; UPS; XPS; NEXAFS;

D O I：

10.1016/j.susc.2005.12.050

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：

We present a detailed investigation of the interface bonding of 3,4,9,10-perylene-tetracarboxylic acid dianhydride (PTCDA) on Ag(111) and Ag(110) surfaces by a combination of structural and electronic techniques (SPA-LEED, STM, TPD, UPS, HR-XPS, and NEXAFS) thus obtaining a consistent picture of the adsorption behaviour of PTCDA/Ag in the monolayer regime. The interaction with silver is strong and leads to the formation of new common hybrid orbitals in the monolayer, which are interface states for PTCDA films on Ag, involving at least LUMO, HOMO, and HOMO-1, and the Ag5s- and 4d-states. This chemisorption is based on a covalent interaction between metal and molecular states, and can unambiguously be distinguished from mere van-der-Waals bonding. (c) 2006 Elsevier B.V. All rights reserved.

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页码：1240 / 1251

页数：12

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