Preparation of CuCl1−xIx thin films by spin coating

Abstract

CuCl1−XIX thin films were prepared to create variable band gap, transparent p-type semiconductor without use of vacuum processes, by employing spin coating. The X-ray diffraction analysis spectra of the fabricated CuCl1−XIX thin films revealed the dominant CuCl1−XIX peak shift to a higher angle with decreasing mixing ratio X. In the compositional analysis, the dependence of the film composition X on the solution composition x was confirmed. The exciton absorption band for each composition was observed from 370 to 420 nm, revealing that the absorption wavelength varied with X. The ionization potential was obtained by photo yield spectroscopy to study the energy band structure of CuCl1−XIX. The CuCl1−XIX ionization potential increases with increases in X. On the basis of the present results, which suggests that the valence band maximum for CuCl1−XIX depends on the composition, an energy band structure was proposed for this material.