Observation of Individual (Quantum) Emitters Formed by Different Types of Dislocation Cores in Cadmium Telluride Films

In a CdTe film with an oriented system of (111) stacking faults, the presence of two types of luminescent centers characterized by a high degree of linear polarization of emission and exhibiting different orientations of the linear polarization plane with respect to the preferred direction [–111] is shown. An analysis of individual (quantum) emitters associated with these centers allows us to state that they are exciton states formed by fragments of partial dislocations cores of two different types. The spectral position and polarization of emitters of the first type indicate their relation to 90° Shockley dislocations with Te core. The presence of emitters of the second type suggests that at least one of the three remaining types of partial dislocations (90° with Cd core, 30° with Te and Cd cores) forms shallow exciton states with high luminescence intensity.