Quantum Sized Semiconductor Particles in Solution and in Modified Layers

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AbstractThe preparation of highly monodisperse, quantum‐sized CdS particles is described. In these samples a band splitting into discrete exciton‐like states is observed.—Quantum‐sized CdS and PbS particles prepared in situ on highly porous, polycrystalline TiO2 electrodes work as highly efficient sensitizers. Photocurrent yields of more than 70% are reported. In the case of PbS it is shown that an efficient electron transfer is only possible with particles in the size quantization regime.