| Abstract
| - The film formation behaviors of the photocatalytic deposition method are investigated using copperphthalocyanines (α, β, and ε forms of CuPc), metal-free phthalocyanines (α, β, and x forms of H2Pc), andN,N‘-3,5-xylyl-3,4,9,10-perylene tetracarboxylic diimide. The detailed analyses based on a diffusion equationreveal that the film deposition is controlled by the diffusion of pigment particles from the dispersion bulkto the substrate. This leads to the finding that the average size of the pigment particles composing thefilms is smaller than that of the particles composing the dispersions. An additional finding is the fact thatthe packing density of the films remains constant during their growth. These features of fundamentalimportance enable the preparation of two types of composite films. One is a double-layered structure witha graded junction profile, and the other is a mixed film with a homogeneously blended concentration profilealong the thickness. These structures are characterized by scanning electron microscopic analysis, X-rayphotoelectron spectroscopy, and UV−vis spectroscopy.
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