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 angstrom. 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-angstrom-period superlattice. Our experimental findings give evidence of Bloch type perpendicular transport in electron and heavy-hole minibands.