Role of molecular anchor groups in molecule-to-semiconductor electron transfer

Article Abstract:

The dynamics of heterogeneous electron transfer (ET) from the polycyclic aromatic chromophore perylene to nanostructured Ti[O.sub.2] anatase is examined for two different anchor groups by using transient absorption spectroscopy in an ultrahigh vacuum. The electronic coupling mediated by the carboxylic group is found to be higher than the phosphonic one, which arises from differences in the local symmetry of the anchor groups rather than differences in the adsorbate-surface distance.

Electric properties, Electron transport, Titanium dioxide, Aromatic compounds, Structure, Carboxyl compounds

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Depth profiling of charging effect of Si nanocystals embedded in Si[O.sub.2]: A study of charge diffusion among Si nanocrystals

Article Abstract:

Si nanocrystal (nc-Si) embedded in Si[O.sub.2] thin film is formed with low-energy Si ion implantation and the depth profiling of the charging effect of the nc-Si is determining from X-ray photoemission measurement. When nanocrystal layer is used as the charge-storage layer in the memory cells, the stored charges can be lost because of the rapid charge diffusion among the nc-Si if a single defect exists in the tunneling oxide, causing a reliability problem in data retention.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Silicon, Analysis, Nanotechnology, Photoemission, Chemical properties

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