OBSERVATION AND MODELING OF QUASI-EPITAXIAL GROWTH OF A CRYSTALLINE ORGANIC THIN-FILM

被引:40
作者
BURROWS, PE [1 ]
ZHANG, Y [1 ]
HASKAL, EI [1 ]
FORREST, SR [1 ]
机构
[1] UNIV SO CALIF,DEPT ELECT ENGN ELECTROPHYS & MAT SCI,LOS ANGELES,CA 90089
关键词
D O I
10.1063/1.108183
中图分类号
O59 [应用物理学];
学科分类号
摘要
We directly observe, using the scanning tunneling microscope, a two-dimensional crystal of the organic compound 3, 4, 9, 10-perylenetetracarboxylic dianhydride (PTCDA). The surface unit cell dimension is found to be 21.6 +/- 2.2 angstrom by 15.2 +/- 1.6 angstrom, or approximately 20% larger than the bulk unit cell. Furthermore, the organic lattice is oriented with respect to the graphite substrate even though the two lattices are incommensurate. These observations are consistent with reflection high energy electron diffraction measurements, and energy minimization calculations, assuming that the van der Waals bond is the predominant intermolecular force which determines the equilibrium crystal structure. The combination of measurement and theory provides the first step in developing tools for predicting the conditions which lead to quasiepitaxial growth of these technologically important van der Waals solids.
引用
收藏
页码:2417 / 2419
页数:3
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