Fe-57 and Sn-119 Mossbauer spectroscopy of the CuAlS2 chalcopyrite semiconductor

Fe-57 and Sn-119 Mossbauer spectroscopy of the CuAlS2 chalcopyrite semicond uctor has been carried out at the room temperature. The values of the isome ric shift (IS) and quadrupolar splitting (QS) are determined. It is establi shed that at doping of the CuAlS2 compound by replacement of 2 at% of alumi nium atoms of iron are as in three-valent state, occupying structural posit ions of atoms of aluminium and in two-valent one. The change in the chargin g condition of atoms of iron is caused by the kinetics of formation of tern ary compounds from the constituent elements, occupation by iron atoms of st ructural positions of copper, influence (shielding) of acceptor impurities. Atoms of tin on doping of the CuAlS2 and CuGaS2 compounds cause replacemen t of 2 at% of sulphur and are included into sites of anion's sub-lattice, t hey are in two-valent state and the value of IS is determined by their loca l state. (C) 1999 Elsevier Science B.V. All rights reserved.