SYNTHESIS AND PHOTOCHEMISTRY OF QUANTUM-SIZE SEMICONDUCTOR PARTICLES IN SOLUTION AND IN MODIFIED LAYERS

Citation
H. Weller et al., SYNTHESIS AND PHOTOCHEMISTRY OF QUANTUM-SIZE SEMICONDUCTOR PARTICLES IN SOLUTION AND IN MODIFIED LAYERS, Israel Journal of Chemistry, 33(1), 1993, pp. 107-113
Citations number
20
Categorie Soggetti
Chemistry
Journal title
ISSN journal
00212148
Volume
33
Issue
1
Year of publication
1993
Pages
107 - 113
Database
ISI
SICI code
0021-2148(1993)33:1<107:SAPOQS>2.0.ZU;2-Y
Abstract
We describe the preparation of highly monodisperse, quantum-size CdS p articles. In these samples a band splitting into discrete exciton-like states is observed. A mechanism for the excitonic fluorescence is pre sented involving shallow traps as a reservoir for electrons which fina lly recombine with free positive holes across the bandgap. Quantum-siz e CdS and PbS particles prepared in situ on highly porous, polycrystal line TiO2 electrodes work as highly efficient sensitizers. Photocurren t yields of more than 70% are reported. In the case of PbS, it is show n that an efficient electron transfer is possible only with particles in the size of the quantization regime.