UPS fine structures of highest occupied band in vanadyl-phthalocyanine ultrathin film
UPS fine structures of highest occupied band in vanadyl-phthalocyanine ultrathin film
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DOI：
10.1016/j.elspec.2005.01.083
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发表时间：
2005-06-01
影响因子：
1.9
通讯作者：
Ueno, N
中科院分区：
文献类型：
--
作者：
Fukagawa, H;Yamane, H;Ueno, N
对石墨上制备的酞菁钒（VOPc）超薄薄膜进行了紫外光电子能谱测试，研究了分子取向和电偶极子层对有机电子态的影响。VOPc具有垂直于分子平面的永久电偶极子，因此可以利用定向单层有意地制备定义良好的电偶极子层。发现定向单层和双层之间最高已占据分子轨道（HOMO）带的结合能差与真空能级位移一致，从而得出分子在电偶极子层中相对于底物费米能级的能级发生变化的结论。(c) 2005 Elsevier B.V.版权所有
Ultraviolet photoelectron spectra were measured for vanadyl phthalocyanine (VOPc) uhrathin films prepared on graphite to study effects of the molecular orientation and the electric dipole layer on the organic electronic states. VOPc has a permanent electric dipole perpendicular to the molecular plane, hence a well-defined electric dipole layer could be intentionally prepared by using the oriented monolayer. The observed binding-energy difference of the highest occupied molecular orbital (HOMO) bands between the oriented monolayer and the double layer was found to agree with the vacuum level shift, leading to a conclusion that the molecular energy level with respect to the substrate Fermi level is changed when the molecule is in the electric dipole layer. (c) 2005 Elsevier B.V. All rights reserved.