Chemical bonding of PTCDA on Ag surfaces and the formation of interface states |
| |
Authors: | Y. Zou Th. Schmidt E. Umbach |
| |
Affiliation: | Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany |
| |
Abstract: | We present a detailed investigation of the interface bonding of 3,4,9,10-perylene-tetracarboxylic acid dianhydride (PTCDA) on Ag(1 1 1) and Ag(1 1 0) 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 Ag 5s- 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. |
| |
Keywords: | PTCDA Ag(1 1 1) Ag(1 1 0) Interface Bonding Chemisorption LEED UPS XPS NEXAFS |
本文献已被 ScienceDirect 等数据库收录! |
|