Abstract
The X-ray photoemission study of the Zn(3d 5 2 ) , Hg(5d 5 2 ) and Te(4d 5 2 )> core levels for Zn x Hg 1− x Te bulk crystals has been carried out in the complete x composition range. The corresponding binding energies relative to the valence-band maximum are measured as a function of x. Because of a relaxation in the lattice of the alloy, neither of the cation levels are affected by alloying on an absolute energy scale. By combining their shifts, the natural valence-band offset is deduced: its value ( ΔE v = 0.17 eV) appears smaller than the Cd x Hg 1− x Te value ( ΔE v) = 0.35 eV). Between ZnTe and HgTe, the main part of the variation of the va ence-band maximum is found for semimetallic compositions. The deeper Te(4d 5 2 ) level position varies in the same manner, but with a small bowing resulting from the disorder.
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