The structure and properties of phthalocyanine films grown by the molecular beam epitaxy technique. I. Preparation and characterization

Abstract

Ultrathin films of the cofacially stacked F-bridged Al-phthalocyanine polymer, (AlPcF)n , have been grown using the highly controlled technique of molecular beam epitaxy. A parallel orientation of the polymer backbone to the substrate surface occurs in films on silicon and quartz, but epitaxy is not apparent. On single-crystal alkali halide substrates, the backbone is perpendicular to the substrate surface, and an epitaxial relationship exists that is influenced by the interaction between the substrate and phthalocyanine molecule. The transmission electron microscopy studies indicate that the most highly ordered films are produced on KBr(100) and have good continuity and unidirectional crystallite orientation.

Correlation of Molecular Orientations at the Interface of Organic Double-Layered Thin Films

“…In practice, a reciprocal lattice vector directed normal to the plane, GI, 90. 16(3) 108.620 (9) 108 PBDCI between vapor-deposited films prepared with different deposition rates onto substrates at room temperature and the polycrystalline powder; the upper pattern was obtained for a film prepared with a deposition rate faster than that for a film showing the middle pattern. It has turned out that local structures can be the same as each other and that evaporated films demonstrate only three reflections: (0 1 l), (0 0 2) and (0 1 2), while a relative intensity of (0 0 2) reflection depends on deposition rate during preparation of the film.…”

“…We have therefore studied structural characteristics, in particular, molecular orientations in respective layers of the film on the basis of refined structures of single crystals of the component materials, by means of X-ray diffraction and polarized electronic absorption spectroscopy, although these methods may be of indirect observation and also of low resolution in comparison with those used for extended work on ultra-thm films of phthalocyanines by Maruyama, el a/. [9][10][11][12][13][14][15][16][17][18] EXPERIMENTAL Sample materials of DM-PBDCI and ClAlPc, molecular structures of which are shown in Figure 1, were lundly supplied by M. Yoshikawa at RICOH Co., Ltd., after prepurification of the materials purchased from B. A. S. F. and Eastman-Kodak Ltd., respectively.…”

Molecular arrangement of copper phthalocyanine on hydrogen-terminated Si(111): Influence of surface roughness

“…Metal Pc are found to be semiconductive molecular crystals having several polymorphs which determine the energy state, the band gap, and the anisotropy of electrical conductivity. 1 In order to examine the molecular arrangement and crystal orientation, vacuum-deposited films were prepared on various substrate materials; [2][3][4][5][6][7][8][9] however, very few reports stated the influence of the surface morphology of the substrate. Tada and co-workers reported that vanadyl phthalocyanine ͑VOPc͒ and chloroaluminum phthalocyanine ͑AlPcCl͒ grew epitaxially with their molecular columns perpendicular to the flat hydrogen-terminated Si͑111͒ substrate ͕Si͑111͒-H͖, which was flattened by boiling-water etching, but not on relatively rough Si͑111͒-H or Si͑100͒-H. 2 Recently, in the case of the copper phthalocyanine ͑CuPc͒, it was found to grow epitaxially even on the relatively rough Si͑100͒-H at 90-180°C.…”

Dynamics of Fermi resonance solitary waves propagating along two interfaces

“…The latest achievements in this field were demonstrated in a number of publications. [1][2][3][4][5] At present, investigations in this direction are developing further, therefore the analysis of qualitatively new properties of OCS is very topical and important. The interaction of OCS with light is a fundamental physical problem, as well as of importance for future applications.…”