Abstract
Optical absorption of the diluted magnetic semiconductor Zn1—xCoxSe (x = 0.02) has been measured at room temperature under hydrostatic pressure up to 14 GPa in a membrane diamond-anvil cell. We found two absorption features: (i) an absorption structure in the energy range 1.5 to 1.8 eV, with a negligible pressure shift (i.e. (0.45 ± 0.05) meV/GPa) which we have identified as the Co2+(3d7) internal transition 4A2(F) →4T1(P) and (ii) an onset in the energy range 2 to 2.7 eV which redshifts with pressure (dE/dP = (—8.1 ± 0.6) meV/GPa). We have attributed such absorption edge to charge transfer between the ZnSe valence band and the Co2+(3d7) levels. On the assumption that those levels are absolute energy references, a valence band deformation potential of (—0.8 ± 0.07) eV has been derived.
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