Organic Photoconductors. II. Crystal Violet

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Abstract
Photoconductivity in crystal violet is a volume effect primarily, and surface or electrode complications have not been recognized. Donor and trapping impurities may be introduced into films, but the highly purified substance shows a large photoconductivity. The thermoelectric effect is normal. On the other hand, rates are extremely slow, there is a prominent long‐lived memory effect, and under certain circumstances the second‐order rate constant for a particular decay process is inversely proportional to the initial conductance. A hypothesis is proposed to account for the last‐mentioned peculiarity, in terms of which structures are formed in the film which have the property of maintaining a constant initial density of charge carriers; the steady‐state conductance being no longer a measure of their density but only of their total number.

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