Structure and Electron States of Co-phthalocyanine Interacting With the Cu(111) Surface
Structure and Electron States of Co-phthalocyanine Interacting With the Cu(111) Surface
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DOI：
10.1021/jp203200s
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发表时间：
2011-09-08
影响因子：
3.7
通讯作者：
Rossi, G.
中科院分区：
文献类型：
--
作者：
Annese, E.;Fujii, J.;Rossi, G.
我们研究了Co-酞菁(CoPc)分子层在铜(111)表面的生长和电子性质。扫描隧道显微镜显示，CoPc分子首先在Cu(111)台阶边吸附，平放，即平行于衬底。在单层覆盖下，分子以短程有序的方式均匀分布在铜(111)表面。角度相关的N-1S X射线吸收光谱(XAS)证实了整体的平坦取向。C1S、N1S、芯级光电子能谱和Co-L-3边XAS表明这些原子选择性地参与了界面键。角分辨光电子能谱表明，铜(111)表面态发生了向低结合能的转变。这种结合能的移动和有效质量的增加表明了CoPc/Cu(111)界面的电荷重新分布。在单层饱和时，Cu(111)表面态猝灭，在结合能为0.9 eV时出现新的分子态。
We studied the growth and the electronic properties of Co-phthalocyanine (CoPc) molecular layers on Cu(111). Scanning tunnelling microscopy shows that the CoPc molecules adsorb first at the Cu(111) step edges, lying "flat", i.e., parallel to the substrate. At monolayer coverage, the molecules distribute uniformly on the Cu(111) surface with short-range ordering. Angle-dependent N 1s X-ray absorption spectroscopy (XAS) confirms the overall flat orientation. C 1s, N 1s, core-level photoemission, and Co L-3 edge XAS indicate selective participation of these atoms to the interface bonds. Angle-resolved photoemission, for submonolayer coverage, shows that the Cu(111) surface states undergo a shift to lower binding energies. This binding energy shift and the increase in the effective mass indicate charge redistribution at the CoPc/Cu(111) interface. At monolayer saturation, the Cu(111) surface state is quenched, and new molecular states appear at binding energies of 0.9 eV.