Electronic structure of ultrathin heteromolecular organic-metal interfaces: SnPc/PTCDA/Ag(111) and SnPc/Ag(111)
Electronic structure of ultrathin heteromolecular organic-metal interfaces: SnPc/PTCDA/Ag(111) and SnPc/Ag(111)
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超薄异分子有机金属界面的电子结构：SnPc/PTCDA/Ag(111)和SnPc/Ag(111)
DOI：
10.1103/physrevb.82.235432
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发表时间：
2010
影响因子：
3.7
通讯作者：
F. Reinert
中科院分区：
文献类型：
--
作者：
M. Häming;M. Greif;C. Sauer;A. Schöll;F. Reinert
用芯能级和价态光电子能谱以及功函数测量研究了SnPc/PTCDA/Ag（111）异质分子界面和SnPc/Ag（111）界面。因此，第一和第二吸附物单层之间的相互作用与对于基底和第一吸附物层之间的相互作用所发现的相比是相对弱的和非共价的。此外，观察到的异质分子膜的SnPc光谱的刚性的能级位移，其随SnPc覆盖率的增加而减少，类似于已知的肖特基接触。它将被证明，内置在界面处的电场可以解释由一个界面偶极子，它延伸到几个吸附物单层的形成。此外，与SnPc/Ag（111）薄膜的比较表明，中间层可以改变界面偶极子。
The SnPc/PTCDA/Ag(111) heteromolecular interface and the SnPc/Ag(111) interface are studied by photoelectron spectroscopy of the core-level and the valence regime as well as by work-function measurements. Accordingly, the interaction between the first and the second adsorbate monolayer is comparatively weak and noncovalent in contrast to what is found for the interaction between the substrate and the first adsorbate layer. Furthermore, a rigid level shift is observed for the SnPc spectra of the heteromolecular film, which decreases with increasing SnPc coverage, similar to what is known for Schottky contacts. It will be demonstrated that the built-in electric field at the interface can be explained by the formation of an interface dipole, which extends over several adsorbate monolayers. Moreover, the comparison with the SnPc/Ag(111) film suggests that the interface dipole can be altered by the interlayer.