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Microwave conductivity is observed in TiO 2 and CuI films at room temperature. Organic dye pyrogallor red is found to sensitize TiO 2 and CuI in solid-state TiO 2 ∣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.