ORIENTATION OF VANADYL PHTHALOCYANINE GROWN BY MOLECULAR-BEAM EPITAXYON KBR-KCL MIXED-CRYSTALS WITH VARIOUS LATTICE-CONSTANTS

We have studied the effect of the lattice constants of substrates on t he crystal orientation of films grown by molecular beam epitaxy. Vanad yl phthalocyanine films were epitaxially grown on KBr-KCl mixed crysta ls with continuously varying lattice constants, The unidirectional (3 x 3)R45 degrees orientation and the bidirectional (root 10 x root 10)R +/- 27 degrees orientation were predominant on the KBr-rich and KCl-r ich substrates, respectively. We found that the orientation changes fr om the (3 x 3)R45 degrees structure to the (root 10 x root 10)R +/- 27 degrees structure at about the KCl fractions of 20 wt%.