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Abstract
The polycrystalline VOPc films in phases I, II, and a less-crystallized α-form have been fabricated on an indium-tin-oxide-glass substrate. Room-temperature and low-temperature visible absorption spectroscopy. Fourier-transform infrared spectra, and X-ray diffraction patterns have been used to characterize and analyze the packing structures and interactions of VOPc molecules. Bethe splitting. broadening, and redshift of the Q absorption band have been observed in the three packing structures. Thermochromism was found in phase II and the less-crystallized α-form, but not in phase I, from the temperature dependence of the absorption spectra. The liquid nitrogen was found to be effective in the crystallization of VOPc molecules.
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