OPTICAL, ELECTRICAL AND MAGNETIC PROPERTIES OF CHALCOPYRITE, CuFeS2

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Abstract
Various optical, electrical and magnetic properties of a magnetic semiconductor, CuFeS2, have been studied. Optical absorption spectra show the absorption edge at 0.6 eV for CuFeS2 and strong absorption bands at 1.3 eV and 2.0 eV for Fe-doped CuAlS2. Photoconductivity is also observed at the same energy region of the absorption edge. These strong absorptions originate from the charge transfer transitions relating to 3d orbitals of Fe and the absorption edge of CuFeS2 rises from the band-to-band transition corresponding to this charge transfer transition. For n- and p-type CuFeS2 electrical conductivities increase slightly with decreasing temperature and carrier concentrations do not depend on temperature. Mobility has small value as 10 cm2/V.s for n-type specimen and 1 cm2/V.s for p-type. Magnetic susceptibility is also temperature independent between 40 K and 600 K and its magnitude is 10-3 per mol. These apparent metallic behaviours of electric and magnetic properties are understood from a model of a degenerate semiconductor where 3d orbitals are appreciably admixed with s and p orbitals and compose both the conduction and valence band

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