PREPARATION AND QUANTUM CONFINEMENT EFFECT OF PBI2 CDI2 SUPERLATTICES/

PbI2/CdI2 superlattices (multi-quantum well) have been grown by a hot wall epitaxy. Characteristic peaks due to a long period of superlattic es appear on X-ray diffraction patterns. From the analysis of these pa tterns, thicknesses of both PbI2 and CdI2 layers of prepared samples a re identified. Optical measurement shows that exciton transition energ ies in PbI2/CdI2 superlattices shift to the higher energy side with th e decrease in thickness of PbI2 layer. The analysis of this shift by t he variational calculation of exciton and the observation of strong ex citon peaks indicate PbI2/CdI2 superlattices belong to the type I supe rlattice. Copyright (C) 1996 Elsevier Science Ltd