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in these structures is the conduction band offset. By decreasing the size of CdSe nanocrystals grown on TiO₂, Robel et al. found that electrons transferred faster from the higher CdSe conduction band into TiO₂. In CdSe the quantum size effect is much more pronounced in the conduction band due to the smaller effective mass than in the valence band, and this is the case with most semiconductors. Consequently, engineering the conduction band offset is typically much easier with nanoscale

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