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The addition of ortho‐chloranil to the surface of films of metal‐free phthalocyanine has been found (a) to increase the dark conductivity of such films by as much as 107, (b) to increase the steady‐state photoconductivity by as much as 105, and (c) to result in the formation of unpaired electrons whose concentration decreases reversibly as a result of illumination. These systems exhibit a light‐induced polarization, the phthalocyanine layer becoming more positive with respect to the ortho‐chloranil layer. Kinetic studies demonstrate that, upon illumination, a single process (time constant=60 sec) results in the increase in conductivity, the decrease in unpaired spins and the increase in polarization. The results are consistent with the following scheme. An electron transfer from phthalocyanine to ortho‐chloranil occurs in the dark at room temperature producing holes in the phthalocyanine layer and ortho‐chloranil negative ion radicals (high conductivity, ESR signal). Illumination results in the transfer o...

Electrical Properties of Organic Solids. II. Effects of Added Electron Acceptor on Metal-Free Phthalocyanine