Photoluminescent Response of Palladium-Cadmium Sulfide and Palladium-Graded Cadmium Sulfoselenide Schottky Diodes to Molecular Hydrogen.
WISCONSIN UNIV-MADISON DEPT OF CHEMISTRY
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The bulk photoluminescence PL of Schottky diodes constructed from Pd and n-type CdS Pd-CdS and from n-type, graded CdSxSe1-x 0 less than or x less than or 1 x - 1 at surface Pd-CdSxSe1-x is sensitive to molecular H2. For the Pd-CdS diode, exposure to H2 31, N2H2 mixture significantly enhances the PL intensity of edge emission lambda max approx. 510 nm relative to the intensity in air using a dead-layer model, the corresponding reductions in depletion width and Schottky barrier height can be estimated. For the Pd-CdSxSe1-x dioded, H2 changes the spectral distribution PL from this material, color-coded to spatially resolve e--h pair recombination, indicates the depth over which the electric field is reduced in the semiconductor. These phenomenal demonstrate optically-coupled chemical sensing of hydrogen. Author
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- Solid State Physics