Abstract
Vanadyl-phthalocyanine (VOPc) thick films were prepared by a molecular beam epitaxy (MBE) on KBr substrate. The morphologies and nonlinear optical properties of VOPc thick films before and after organic gas treatment were investigated with Vis/UV spectra, the incident angle dependence of second harmonic (SH) and third harmonic (TH) intensity measured by Maker fringe. The Vis/UV spectrum of Sample 1 has an absorption peak at 780 nm. Therefore, the phase morphology of Sample 1 is a pseudoepitaxy. Sample 1 exposed for 25 hrs in 1.8 atm organic gas prepared with 1, 2 -dichloloethane changes from pseudoepitaxy to epitaxy. On the other hand, Sample 1 exposed in carbon tetrachloride gas does not change from pseudoepitaxy to epitaxy. These results were explained with the donor-acceptor interaction between a VOPc and carbon tetrachloride molecule.
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