A low-temperature photoluminescence and selective photoluminescence spectroscopic investigation was made of monocrystals which had been prepared by means of solid-phase recrystallization. It was found that the photoluminescence spectra were dominated by the so-called I1deep excitonic line, a neutral-acceptor bound-exciton line, I1, the FX free-exciton emission, and the n = 2 excited state of FX. Donor-acceptor pair bands were hardly detected. A major characteristic of these samples was the essential absence of any of the Cu-related deep emissions which usually marred the photoluminescence spectra of bulk ZnSe. As a result, I1deep was attributed to an exciton that was bound to a Zn vacancy-related acceptor. The results indicated that the present samples were of high quality and that solid-phase recrystallization was a promising technique for the preparation of ZnSe epitaxial substrates.

E.Tournié, C.Morhain, G.Neu, J.P.Faurie, R.Triboulet, J.O.Ndap: Applied Physics Letters, 1996, 68[10], 1356-8