Yg. Shreter et al., DISLOCATION-RELATED ABSORPTION AND PHOTOLUMINESCENCE IN DEFORMED N-ZNSE CRYSTALS, Journal of crystal growth, 159(1-4), 1996, pp. 883-888
It has been found that the Y-0 line appears in photoluminescence (PL)
and absorption of n-ZnSe crystals after plastic deformation. The conce
pt of the dislocation exciton has been used to interpret the results.
The binding energy of the dislocation exciton has been determined as 2
7 meV. It is suggested that dislocation excitons are destroyed by disl
ocation charge and, therefore, the Y-0 line can be related only to unc
harged or slightly charged dislocations. It has also been found that t
he edge of the absorption spectra of the deformed and undeformed cryst
als are significantly extended as a result of the Franz-Keldysh effect
from charged dislocations. Stress birefringence has also been observe
d in the deformed crystal.