Pt（111）- ZnPc界面的电荷转移及碘的影响
Site-dependent charge transfer at the Pt(111)-ZnPc interface and the effect of iodine
摘要：
用X射线光电子能谱学（XPS）、X射线吸收谱（XAS）和扫描隧道显微镜（STM）研究了酞菁锌（ZnPc）在Pt（111）表面从亚单层到厚膜的电子结构。我们的研究结果表明，在低覆盖率ZnPc几乎平行于Pt（111）衬底，在一个非平面的配置由Zn-Pt吸引诱导，导致在分子内的电荷分布和电荷转移到分子内的不均匀。由于表面介导的分子间排斥，ZnPc在Pt表面上不形成完整的单层。在较高的覆盖率ZnPc采用倾斜的几何形状，由于减少的分子-衬底相互作用。我们的光电发射结果表明，ZnPc实际上是从Pt去耦，已经从第二层。碘在Pt上的预沉积阻碍了Zn-Pt吸引，导致与Pt（111）-I $\left(\sqrt{3}\times\sqrt{3}\right)$或Pt（111）-I $\left(\sqrt{7}\times\sqrt{7}\right)$接触的非畸变第一层ZnPc，以及界面处更均匀的电荷分布和电荷转移。在增加的ZnPc厚度上，碘溶解在有机膜中，在那里它充当电子受体掺杂剂。
英文摘要：
The electronic structure of ZnPc, from sub-monolayers to thick films, on bare and iodated Pt(111) is studied by means of X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS) and scanning tunneling microscopy (STM). Our results suggest that at low coverage ZnPc lies almost parallel to the Pt(111) substrate, in a non-planar configuration induced by Zn-Pt attraction, leading to an inhomogeneous charge distribution within the molecule and charge transfer to the molecule. ZnPc does not form a complete monolayer on the Pt surface, due to a surface-mediated intermolecular repulsion. At higher coverage ZnPc adopts a tilted geometry, due to a reduced molecule-substrate interaction. Our photoemission results illustrate that ZnPc is practically decoupled from Pt, already from the second layer. Pre-deposition of iodine on Pt hinders the Zn-Pt attraction, leading to a non-distorted first layer ZnPc in contact with Pt(111)-I $\left(\sqrt{3}\times\sqrt{3}\right)$ or Pt(111)-I $\left(\sqrt{7}\times\sqrt{7}\right)$, and a more homogeneous charge distribution and charge transfer at the interface. On increased ZnPc thickness iodine is dissolved in the organic film where it acts as an electron acceptor dopant.
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