Abstract
The optical absorption spectra of the ordered vacancy compound CuIn4Se7 thin film have been analysed with special consideration to the threefold optical structure at the fundamental gap. The thin films for this study have been prepared by vacuum co-evaporation and the structural and compositional characterization done using x-ray diffraction in conjunction with energy dispersive x-ray analysis. The quasi-cubic model adapted for crystals with tetragonal distortion has been used to determine the crystal field splitting and spin–orbit splitting parameters. The effects of p–d hybridization and structural changes on the parameters are explained. The percentage of hybridization of the orbitals is determined using the linear hybridization model.
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