Bulk Photoconductivity of p-Chloranil Crystals

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Abstract
The bulk‐photoconductivity properties of substituted p‐benzoquinone crystals with particular reference to p‐chloranil (tetrachloro‐p‐benzoquinone), are presented and discussed. While photocurrents excited by light in the fundamental absorption region of p‐chloranil can probably be considered in terms of exciton processes involving the crystal absorption spectrum, ``anomalous'' photocurrent regions occurring below the main absorption edge can be more reasonably discussed in terms of impurity‐sensitized photocarrier production. A possible mechanism for this sensitization is presented.
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