Abstract
The absorption and luminescence spectra of GaSe single crystals show that the members of the exciton series have doublet character. This doublet character is explained by a model in which the top of the valence band is split at the Γ-point by the interaction between layers (the value of splitting is about 2 meV). The analogy between the peculiarities of the exciton spectrum and those in molecular crystals is shown. Investigations of luminescence, differential absorption and photoconductivity spectra of GaSe crystals at various temperatures in the range of the indirect gap were carried out. The results of these investigations are interpreted in terms of indirect exciton transitions withE g.ind.exc.=2.062 eV at 4.2 K. The proposed band structure permits to predict a new mechanism of stimulated emission in GaSe.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
