Characterization of transparent CuI films and charge generation in dye-sensitized CuI|Dye|TiO2 solar cells

Transparent semiconducting copper iodide (CuI) films were prepared by XeCl excimer laser and their characteristics are investigated. These films exhibited optical transmittance over 80% in the wavelength range from 400 to 900 nm and minimum resistivity of about 2 KΩcm^-1. The optical absorption of the these films shows a remarkable blue shift compared to that of polycrystalline of CuI, which can be explained from the viewpoint formation of ultra fine of CuI grains. The properties of pulsed laser deposited Cul in power output of p-CuI|Dye|n-TiO₂ cells is studied. An efficient charge generation is observed through the illumination of TiO₂ layer of the fabricated p-CuI|Dye|n-TiO₂ cells.