A systematic photoluminescence excitation spectroscopic study was made of Li-passivated p-type material. It was found that, depending upon the diffusion conditions, the Li formed 3 types of center: electrically passive acceptor-Li complexes, interstitial Li+/0 donors and Li-related self-compensating acceptor complexes. The photoluminescence excitation oscillations were explained by hot electron capture into Li+/0 donors; together with the emission of an LO phonon. The local vibrational mode spectra were very different in passivated samples as compared with those in which compensation predominated.

J.Pétursson, S.P.Ingvarsson, B.H.Yang, H.P.Gislason: Materials Science Forum, 1995, 196-201, 207-12