CHEMISTRY AND PHOTOPHYSICS OF MIXED CDS HGS COLLOIDS/

Aqueous co-colloidal systems consisting of two nanocrystalline, size-q uantized groups II-VI semiconductor particles were investigated. Coati ng the HgS colloids with a layer of CdS leads to core-shell-like struc tures with electronic properties differing considerably to the sum of the separate particles. Implantation of HgS in the surface of CdS give s a new system with very colorful fluorescence properties. Evidence fo r a charge carrier transfer in this system is obtained from optical sp ectroscopy. Spectroscopic experiments, as well as electron microscopy studies, give insight into the geometrical and energetic structure and the charge carrier dynamics in such systems.