PTCDA on Au(111), Ag(111) and Cu(111):: Correlation of interface charge transfer to bonding distance
PTCDA on Au(111), Ag(111) and Cu(111):: Correlation of interface charge transfer to bonding distance
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DOI：
10.1016/j.orgel.2007.10.004
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发表时间：
2008-02-01
影响因子：
3.2
通讯作者：
Koch, N.
中科院分区：
文献类型：
--
作者：
Duhm, S.;Gerlach, A.;Koch, N.
用紫外光电子能谱（UPS）研究了3，4，9，10-二萘嵌苯四甲酸二酐（PTCDA）与金属表面Au（111）、Ag（111）和Cu（111）的界面电子结构.结合PTCDA在相同衬底上的X射线驻波数据，发现电子性质与界面几何形状之间存在明显的相关性，分子与金属之间的电荷转移随平均键距沿着排列而增加。PTCDA在Ag（111）和Cu（111）表面上都有明显的电荷转移诱导的占据态。如Zou et al. [Y. Zou等人，冲浪。Sci. 600（2006）1240]在费米能级（E（F））处发现了PTCDA/Ag（111）的新的杂化态，使得单层金属化。相比之下，PTCDA/Cu（111）的杂化状态远低于EF，表明甚至更强的电荷转移，因此是半导体化学吸附分子单层。UPS不能证明分子态和A电子态的杂化。(c)2007 Elsevier B. V.保留所有权利。
The electronic structure at the interfaces of 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) and the metal surfaces Au(111), Ag(111) and Cu(111) was investigated using ultraviolet photoelectron spectroscopy (UPS). By combining these results with recent X-ray standing wave data from PTCDA on the same substrates clear correlation between the electronic properties and the interface geometry is found. The charge transfer between the molecule and the metal increases with decreasing average bonding distance along the sequence Au-Ag-Cu. Clear signatures of charge-transfer-induced occupied molecular states were found for PTCDA on Ag(111) and Cu(111). As reported previously by Zou et al. [Y. Zou et al., Surf. Sci. 600 (2006) 1240] a new hybrid state was found at the Fermi-level (E(F)) for PTCDA/Ag(111), rendering the monolayer metallic. In contrast, the hybrid state for PTCDA/Cu(111) was observed well below EF, indicating even stronger charge transfer and thus a semiconducting chemisorbed molecular monolayer. The hybridisation of molecular and An electronic states could not be evidenced by UPS. (c) 2007 Elsevier B.V. All rights reserved.