Journal
APPLIED SURFACE SCIENCE
Volume 535, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147673
Keywords
Interfacial electric dipole layer; Van der Waals interface; Physisorption system; Organic/metal interface; Electronic structure
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) [16K05956, 18K03484, 17K18749, 19H02683]
- Nanotech Career-up Alliance Project funded from MEXT
- Grants-in-Aid for Scientific Research [17K18749, 18K03484, 19H02683] Funding Source: KAKEN
Ask authors/readers for more resources
The structure and electronic structure of a system comprising molecular layers of n-alkane adsorbed on Au(1 1 1) were investigated to understand the origin of the interfacial electric dipole layer. The study reveals that a relatively strong inter-orbital interaction governs the vdW interface, similar to a weak chemisorption system rather than a physisorption system, which was unexpected. This sheds light on understanding the electrode interface in organic semiconductor devices.
The structure and electronic structure of a system comprising molecular layers of n-alkane adsorbed on Au(1 1 1) were investigated to understand the origin of the interfacial electric dipole layer. These alkane molecules are inert and thus van der Waals (vdW) interaction is the primary adsorptive force. Although these vdW interfaces are regarded as ideal physical adsorption systems unlikely to chemically interact with the metal surface, a large interfacial electric dipole layer over 1 eV is formed. It is important to elucidate the mechanism underlying the generation of such large dipole layers to understand the electrode interface in organic semiconductor devices. Thus, this paper elucidates the details of the vdW interface, in particular between tetratetracontane (TTC) and Au(1 1 1). First, the mechanism of growth of the ITC layer up to monolayer thickness was revealed using a low-energy electron-diffraction method. Second, the interface states were newly formed, as determined using angle-resolved photoelectron spectroscopy, X-ray photoemission spectroscopy, and near-edge absorption fine-structure spectroscopy. Our findings indicate, unexpectedly, that a relatively strong inter-orbital interaction governs this vdW interface, similar to a weak chemisorption system rather than a physisorption system.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available