期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 36, 页码 19969-19979出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c04217
关键词
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资金
- German Research Foundation (DFG) [SFB 1249]
- Hybrid Inorganic/Organic Systems for Opto-Electronics [182087777, SFB 951]
- International Max Planck Research School Functional Interfaces in Physics and Chemistry
- Austrian Science Fund (FWF) [Y1157-N36]
Through experimental methods and theoretical simulations, the electronic properties of 1,3,8,10-tetraazaperopyrene derivatives adsorbed on Au(111) were investigated. The results showed weak physisorption of the molecular layers and hybridization of molecular states with the Au(111) substrate. These findings are important for the design of materials with organic-metal interfaces having a low charge injection barrier.
N-heteropolycyclic aromatic compounds are promising organic electron-transporting semiconductors for applications in field-effect transistors. Here, we investigated the electronic properties of 1,3,8,10-tetraazaperopyrene derivatives adsorbed on Au(111) using a complementary experimental approach, namely, scanning tunneling spectroscopy and two-photon photoemission combined with state-of-the-art density functional theory. We find signatures of weak physisorption of the molecular layers, such as the absence of charge transfer, a nearly unperturbed surface state, and an intact herringbone reconstruction underneath the molecular layer. Interestingly, molecular states in the energy region of the sp- and d-bands of the Au(111) substrate exhibit hole-like dispersive character. We ascribe this band character to hybridization with the delocalized states of the substrate. We suggest that such bands, which leave the molecular frontier orbitals largely unperturbed, are a promising lead for the design of organic-metal interfaces with a low charge injection barrier.
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