Le Journal de Physique IV 03 (1993) C5-159-C5-166
Optical non-linearities due to charge transfer in type II heterostructuresR. PLANEL, R. TEISSIER and F. MOLLOT
Laboratoire de Microstructures et Microélectronique, Centre National de la Recherche Scientifique (L2M-CNRS), BP. 107, 92225 Bagneux cedex, France
We present experimental studies of photocreated carrier population in type II heterostructures. The main effects are related to charge separation and band filling : Blue shift and broadening of the luminescence line, transition from indirect recombination to pseudo-direct, and then to direct-type I recombination. They may lead to more complex non-linear effects such as bistability. These effects can be accounted for by theory in the framework of the Envelope-Function Approximation, by self consistent treatment of the Poisson and Schroedinger equations.
© EDP Sciences 1993