Monolayer structure of tetracene on Cu (100) surface: parallel geometry.
The geometrical arrangement of tetracene on Cu (100) surface at monolayer coverage is studied by using scanning tunneling microscopy measurement and density functional theory (DFT) calculations. Tetracene molecule is found to be oriented with its molecular plane parallel to the substrate surface, and no perpendicular geometry is observed at this coverage. The molecule is aligned either in the [011] or [011] direction due to the fourfold symmetry of the Cu (100) surface. DFT calculations show that the molecule with the "flat-lying" mode has larger adsorption energy than that with the "upright standing" mode, indicating that the former is the more stable structure. With the flat-lying geometry, the carbon atoms prefer to be placed between surface Cu atoms. The molecular center prefers to be located at the bridge site between two nearest surface Cu atoms.
Dou
Weidong
W
Physics Department, Zhejiang University, Hangzhou, 310027, China.
Zhu
Jiabao
J
Liao
Qing
Q
Zhang
Hanjie
H
He
Pimo
P
Bao
Shining
S