Ordered Growth and Electronic Properties of 1,2:8,9-Dibenzopentacene (trans-DBPen) on Ag(111)
Ordered Growth and Electronic Properties of 1,2:8,9-Dibenzopentacene (trans-DBPen) on Ag(111)
复制标题
Ag(111) 上 1,2:8,9-二苯并五苯 (trans-DBPen) 的有序生长和电子性质
DOI：
10.1021/acs.jpcc.8b00095
复制
发表时间：
2018
影响因子：
3.7
通讯作者：
T. Fritz
中科院分区：
文献类型：
--
作者：
F. Otto;T. Huempfner;M. Schaal;C. Udhardt;L. Vorbrink;B. Schroeter;R. Forker;T. Fritz
在此，我们研究了吸附在单晶银表面上的高度有序的二维层 1,2:8,9-二苯并五苯 (trans-DBPen)。虽然其母体分子并五苯以其相对较高的空穴迁移率而闻名，但有关反式-DBPen 的报道却相当稀少。此外，它属于多环芳烃，在插入钾后观察到超导性能。我们的扫描隧道显微镜和低能电子衍射结果揭示了 Ag(111) 上反式 DBPen 的高度有序单层结构。我们进一步使用角分辨紫外光电子能谱来测量光电子动量图（PMM）。实验 PMM 与基于我们的结构数据的模拟非常吻合，同时假设自由分子用于密度泛函理论计算。与并五苯的比较可以让我们对这两种相关分子的特性有一些了解。我们得出结论，分子轨道和底物态之间的杂化程度相对较弱。这些结果有望成为未来研究 K 掺杂单层反式 DBPen 的起点。
Herein, we have studied highly ordered two-dimensional layers of 1,2:8,9-dibenzopentacene (trans-DBPen) adsorbed on a single-crystalline silver surface. While its parent molecule pentacene is known for a relatively high hole mobility, reports ontrans-DBPen are rather scarce. Furthermore, it belongs to polycyclic aromatic hydrocarbons for which superconducting properties have been observed upon intercalation with potassium. Our scanning tunneling microscopy and low-energy electron diffraction results reveal a highly ordered monolayer structure oftrans-DBPen on Ag(111). We further used angle-resolved ultraviolet photoelectron spectroscopy to measure photoelectron momentum maps (PMMs). The experimental PMMs agree very nicely with simulations based on our structural data while assuming free molecules for the density functional theory calculations. A comparison with pentacene yields some insights into the properties of the two related molecules. We conclude that the degree of hybridization between the molecular orbitals and substrate states is comparatively weak. These results are expected to serve as a starting point for future investigations of K-doped monolayers oftrans-DBPen.