Hexacene on Cu(110) and Ag(110): Influence of the Substrate on Molecular Orientation and Interfacial Charge Transfer.

Hexacene on Cu(110) and Ag(110): Influence of the Substrate on Molecular Orientation and Interfacial Charge Transfer.
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Cu(110)和Ag(110)上的并六苯:基底对分子取向和界面电荷转移的影响。

DOI:
10.1021/acs.jpcc.2c00081
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发表时间:
2022-03-17
期刊:
The journal of physical chemistry. C, Nanomaterials and interfaces
影响因子:
--
通讯作者:
Peisert H
Peisert H
中科院分区:
其他
文献类型:
--
作者:
Sättele MS;Windischbacher A;Greulich K;Egger L;Haags A;Kirschner H;Ovsyannikov R;Giangrisostomi E;Gottwald A;Richter M;Soubatch S;Tautz FS;Ramsey MG;Puschnig P;Koller G;Bettinger HF;Chassé T;Peisert H

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己二烯是由六个线性稠合苯环组成的有机半导体材料,具有优异的电子性能。对电子和化学性质的基本了解是任何可能在器件中应用的先决条件。用X射线光电子能谱(XPS)、光电子能谱(POT)、X射线吸收光谱(XAS)、低能电子衍射(LEED)、扫描隧道显微镜(STM)和密度泛函理论(DFT)研究了六茂铁单分子膜在银(110)和铜(110)表面的取向和界面性质。我们发现这两种衬底在分子的结构排列和金属/有机界面的电子性质上有明显的不同。在铜(110)面上,分子以平行于高对称性衬底方向的长分子轴吸附,而在银(110)面上,六角烯分子以相对于衬底金属排的方位角轻微旋转的几何构型吸附。在这两种情况下,分子平面都平行于底物定向。从两个底物到不同分子状态的明显电荷转移会影响分子中不同C原子的有效电荷。通过对实验和理论数据的分析,我们发现在Ag(110)面上,分子的LUMO是通过金属的电荷转移占据的,而在Cu(110)面上,甚至LUMO+1也是通过电荷转移来占据的。界面偶极子在很大程度上是由推回效应决定的,6A/Ag(110)和6A/Cu(110)的界面偶极子也有明显的差异。
Hexacene, composed of six linearly fused benzene rings, is an organic semiconductor material with superior electronic properties. The fundamental understanding of the electronic and chemical properties is prerequisite to any possible application in devices. We investigate the orientation and interface properties of highly ordered hexacene monolayers on Ag(110) and Cu(110) with X-ray photoemission spectroscopy (XPS), photoemission orbital tomography (POT), X-ray absorption spectroscopy (XAS), low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), and density functional theory (DFT). We find pronounced differences in the structural arrangement of the molecules and the electronic properties at the metal/organic interfaces for the two substrates. While on Cu(110) the molecules adsorb with their long molecular axis parallel to the high symmetry substrate direction, on Ag(110), hexacene adsorbs in an azimuthally slightly rotated geometry with respect to the metal rows of the substrate. In both cases, molecular planes are oriented parallel to the substrate. A pronounced charge transfer from both substrates to different molecular states affects the effective charge of different C atoms of the molecule. Through analysis of experimental and theoretical data, we found out that on Ag(110) the LUMO of the molecule is occupied through charge transfer from the metal, whereas on Cu(110) even the LUMO+1 receives a charge. Interface dipoles are determined to a large extent by the push-back effect, which are also found to differ significantly between 6A/Ag(110) and 6A/Cu(110).
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