Abstract
Single-phase CuIn 0.75Al 0.25Se 2 thin films were deposited by four-source co-evaporation method on soda lime glass substrates held at 673 K. Post-deposition annealing of the films in selenium atmosphere was carried out for an hour at 723 K. X-ray diffraction (XRD) studies of the films revealed the structure to be chalcopyrite with a = 0.5 7 7 and c = 1.1 4 1 nm . Optical absorption studies of the films indicated three-fold band structure. Crystal field ( Δ CF) and spin–orbit ( Δ SO) splitting parameters were deduced from the optical band gap values obtained. The deformation potential was estimated by using quasi-cubic model and the percentage of hybridization of the orbitals was determined using linear hybridization model. The films are found to be p-type conducting and the temperature dependence of conductivity studies are carried out to determine the activation energies of the films.
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