Electrical conduction mechanism in crystal violet dye sensitised with AgI

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Abstract
The theory of dark conduction in dyes assumes thermal excitation from the ground state to an excited state, followed by trapping of the hole near the electrode. Electrical conductivity studies on crystal violet (CV), an organic dye of industrial importance, have been carried out in both dark and light conditions. The present paper deals with the effect of field, temperature and electrode materials on the electrical conduction in CV as well as in CV sensitised with AgI. These studies suggest that conduction is mainly due to the charge carriers injected from the electrode into the dye (Schottky-Richardson mechanism) and the electron transfer mechanism. Photo and dark activation energies in the sensitised dye have been calculated.

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