Structural defect related donor-bound exciton spectra in CdTe epitaxial films

In previous luminescence studies on CdTe epitaxial films, a line Dμ at 1.593 eV has been associated with the recombination of exciton bound to a neutral donor. We have new evidence to suggest that Dμ cannot be associated with a simple donor impurity, but should be associated with donor-like structural defects or impurity-defect complexes.