Abstract
Electron spin resonance (ESR) and optical absorption spectra have been studied in Ni-doped CuAlS2 crystals, grown by the chemical vapour transport technique. Absorption spectra show optical transitions between 3d-shell originated orbitals of the Ni2+ ion, as well as charge-transfer transitions Ni3+→Ni2+ and Ni2+→Ni+, their intensities being dependent on the position of the Fermi level in the bandgap of the host compound. The ESR results confirm the changes in the relative concentrations of Ni in different charged states caused by the Fermi level shift in the band gap, this shift, in its turn, being caused by thermal treatments of the crystals in various atmospheres.
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