Generation of inhomogeneous photocurrent in solid-state TiO2∣dye∣CuI cells and effect of ligands attached to surfactant on morphology of CuI films

Microwave conductivity is observed in TiO2 and CuI films at room temperature. Organic dye pyrogallor red is found to sensitize TiO2 and CuI in solid-state TiO2∣dye∣CuI cells. Effect of ligands attached to crystal growth inhibitors on morphology of CuI films is studied. A weaker crystal growth inhibition was observed when size of ligands attached to surfactant is increased. Reasonable explanations are given for observed inhomogeneous photocurrent and its degradation under illumination.