Time resolved photoluminescence studies of perpendicular transport in CdTe/Cd1−xMnxTe short‐period superlattices

We present time‐resolved photoluminescence studies of perpendicular transport and the subsequent capture of photoexcited carriers in II–VI semiconductor superlattices with an enlarged quantum well. The trapping dynamics are investigated as a function of the superlattice period in the range of 30–80 A. We observed an efficient collection of electrons and holes in an enlarged CdTe quantum well confined by a short‐period CdTe/Cd1−xMnxTe superlattice. Both the characteristic time and the efficiency of carrier collection are found to be strongly dependent on the superlattice period. A time constant less of than 25 ps is determined for the carrier collection in a 30‐A‐period superlattice. Our experimental findings give evidence of Bloch type perpendicular transport in electron and heavy‐hole minibands.