Open AccessThe molecular orientation and electronic structure of 3, 4, 9, 10-perylene tetracarboxylic dianhydride grown on Au(111)
Author(s) -
Liang Cao,
Wenhua Zhang,
Chen Tie-Xin,
Yong Han,
F. Xu,
Junfa Zhu,
Yan Wen-Sheng,
Yang Xu,
Wenlin Feng
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.1681
Subject(s) - x ray photoelectron spectroscopy , xanes , materials science , monolayer , ultraviolet photoelectron spectroscopy , scanning tunneling microscope , photoemission spectroscopy , crystallography , spectroscopy , chemical physics , chemistry , nanotechnology , nuclear magnetic resonance , physics , quantum mechanics
The interface electronic structure, molecular orientation and surface morphology of the organic semiconductor 3,4,9,10-perylene tetracarboxylic dianhydride PTCDA grown on Au 111 surface have been studied by means of X-ray photoelectron spectroscopy XPS, synchrotron radiation ultraviolet photoelectron spectroscopy SRUPS, near edge X-ray absorption fine structure spectroscopy NEXAFS and atomic force microscopy AFM. It can be seen from the SRUPS results that the Shockley-type Au 111 surface state near the Fermi level extinguishes immediately after sub-monolayer of PTCDA is deposited onto the Au surface without the emergence of interface hybrid state. This indicates that a charge transfer process takes place at the interface between PTCDA molecule and Au111, but does not lead to strong chemical reaction. Angle dependent NEXAFS and SRUPS show that the PTCDA overlayers are ordered and the molecules lie flatly on the Au111 surface. According to the AFM images and the evolution of Au 4f7/2 and C 1s integral intensities with increasing film thickness, the typical Stranski- Krastanov growth mode is proposed for PTCDA deposition on Au111 surface, that is, layer by layer growth followed by island growth mode. The Dewetting transition occurs between the 2D and 3D growth modes.