Cathodoluminescence Study of Cd_1-xMn_xTe and Zn_1-xMn_xTe

Allocation and Properties of Iron States in Cd1-xFexTe in Forbidden Gap Energy Range

“…For pure CdTe, E0 and Epc energy values agree well within experimental error. The rapid jump of Epc value at RT towards lower energies at about 0.1 eV with the introduction of even small amount of iron (x = 0.01) should be thus associated with the process of absorption from the 5E state of iron to CB, while in pure CdTe, PC seems to be determined by the VB → CB transition [12]. As at RT the slopes of E0 and Epc are, within the experimental error, the same, this suggests that the final state in both processes is CBM since the distance between .VBM and the 5E state remains practically the same.…”

“…This result confirms behavior of a bump appearing below the E0 value in the RE spectra after introduction of iron into the CdTe matrix and appearing of a pre-edge maximum in the α(E) dependence, only at LNT. Since the probability of thermal excitation of electron between VBM and the 5E state of iron is about 4 orders smaller at LNT than at RT, then the PC process seems to be determined by VB --ł CB transitions [12]. It is also worth noting that at LNT the 3 I} excitation state of iron is localized very close to the bottom of conduction band and may act as a holding or recombination trap (Fig.…”