Optoelectronic switches based on wide band gap semiconductors

Article Abstract:

The photoelectrochemical properties of surface-modified titanium dioxide with chemisorbed pentacyanoferrate complexes of the [[Fe(CN)5L].sup.n-] type and switching of photocurrent direction in semiconducting system upon changes of the electrode potential or incident light wavelength are described. Upon irradiation, these materials generate anodic and cathodic photocurrents depending on the applied electrode potential, wavelength of incident light, presence of oxygen and ligand L structure.

Science & research, Electric properties, Electron configuration, Metal oxide semiconductors, Structure

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Photosensitization of nanostructured Ti[O.sub.2] with W[S.sub.2] quantum sheets

Article Abstract:

Porous, nanostructured sol gel Ti[O.sub.2] was sensitized with W[S.sub.2] quantum sheets with the help of chemical bath deposition and characterized. The S-W-S layers of W[S.sub.2] were found to be not perfectly aligned in the direction of the c-axis, emphasizing the role of lateral electron transfer, thus with W[S.sub.2] a new, cheap and stable absorber material for the sensitization of wide band gap nonmaterial was introduced.

Sulfides, Tungsten compounds, Photosensitizing agents, Chemical properties

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Differential reactivity of upper triplet states produces wavelength-dependent two-photon photosensitization using Rose Bengal

Article Abstract:

The wavelength dependence of the upper excited state chemistry of the xanthene-type photosensitizer, Rose Bengal, is studied to assess differences in RB-sensitized inhibition of acetylcholinesterase in red blood cell ghosts. Results show that triplet state bleaching caused by radical species formation excites to an upper state at wavelengths greater that 580 nm while no bleaching was observed at lower wavelengths.

Excited state chemistry, Photosensitization, Biological, Biological photosensitization

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