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Control of the dipole layer of polar organic molecules adsorbed on metal surfaces via different charge-transfer channels
Lin, Meng-Kai Nakayama, Yasuo Zhuang, Ying-Jie Su, Kai-Jun Wang, Chin-Yung Pi, Tun-Wen Metz, Sebastian Papadopoulos, Theodoros A. Chiang, Tai-Chang Ishii, Hisao
Lin, Meng-Kai
Nakayama, Yasuo
Zhuang, Ying-Jie
Su, Kai-Jun
Wang, Chin-Yung
Pi, Tun-Wen
Metz, Sebastian
Papadopoulos, Theodoros A.
Chiang, Tai-Chang
Ishii, Hisao
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Publication Date
2017-02-17
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2017.02 PRB.pdf
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Abstract
Organic molecules with a permanent electric dipole moment have been widely used as a template for further growth of molecular layers in device structures. Key properties of the resulting organic films such as energy level alignment (ELA), work function, and injection/collection barrier are linked to the magnitude and direction of the dipole moment at the interface. Using angle-resolved photoemission spectroscopy (ARPES), we have systematically investigated the coverage-dependent work function and spectral line shapes of occupied molecular energy states (MES) of chloroaluminium-phthalocyanine (ClAlPc) grown on Ag(111). We demonstrate that the dipole orientation of the first ClAlPc layer can be controlled by adjusting the deposition rate and post annealing conditions; the ELA at the interface differs by ~0.4 eV between the Cl-up and -down configurations of the adsorbed ClAlPc molecules. These observations are rationalized by density-functional-theory (DFT) calculations based on a realistic model of the ClAlPc/Ag(111) interface, which reveal that the different orientations of the ClAlPc dipole layer lead to different charge-transfer channels between the adsorbed ClAlPc and Ag(111) substrate. Our findings provide a useful framework towards method development for ELA tuning.
Citation
Lin, M.-K., et al. (2017). Control of the dipole layer of polar organic molecules adsorbed on metal surfaces via different charge-transfer channels. Physical Review B, 95(8), 085425. DOI: 10.1103/PhysRevB.95.085425
Publisher
American Physical Society
Journal
Physical Review B
Research Unit
DOI
10.1103/PhysRevB.95.085425
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Article
Language
en
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ISSN
EISSN
2469-9969