Abstract
Photoconductivity (PC) and Photoluminescence (PL) studies of Cd 1 − xMn xTe are reported in the ranges of composition 0.15 ⪅ x ⪅ 0.40 and temperature 10 ⪅ T ⪅ 300 K. The results of this study show that p-d transitions make an important contribution to the optical properties of Cd 1 − xMn xTe in the above range of compositions. Based on UPS and an estimate of the spin-flip energy for the Mn d electrons in Cd 1 − xMn xTe from literature data we place the centers of the Mn d↑ and Mn d↓ bands contributing to the photoemission and p-d transition processes at -3.5 eV and +2.0 eV, respectively, relative to the Γ 8 valence band edge. Strong changes in both the PL and PC spectra are observed when the Γ 6 conduction band edge shifts through the Mn 3d↓ levels. This explains the specific temperature dependence of the PC for x = 0.32 and the strong increase in the normalized intensity of the PL band at 2.0 eV at x ⪆ 0.35. The shift in the binding energy of the excitonic contribution to the PC with temperature agrees well with the model of Golnik on interactions of the excitons with the Mn 2+ spins.
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