Nano Vanadyl-phthalocyanine Crystals Fabricated on KBr Substrate

Abstract

Vanadyl-phthalocyanine (VOPc) thin film deposited on a KBr substrate by the molecular beam epitaxy (MBE) method consists of nano-VOPc crystals grown with epitaxy. The nano-VOPc crystal becomes a commensurate square shape by the annealing treatment at 150°C. Moreover, the size of the nano-crystal is controllable by changing the conditions of the MBE deposition and the thermal treatment. The growth processes of nano-crystals on KBr substrate are clarified experimentally and they are closely related to a strong interaction between VOPc molecule and KBr substrate. Their mechanisms can be explained in terms of the surface diffusion of the VOPc moleculs on KBr substrate.