1. High responsivity and internal gain mechanisms in Au-ZnMgO Schottky photodiodes.
- Author
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Tabares, G., Hierro, A., Ulloa, J. M., Guzman, A., Muñoz, E., Nakamura, A., Hayashi, T., and Temmyo, J.
- Subjects
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PHOTODIODES , *LIGHTING , *SCHOTTKY barrier diodes , *ULTRAVIOLET spectra , *PHOTON emission , *ELECTRIC currents - Abstract
Schottky photodiodes based on Au-ZnMgO/sapphire are demonstrated covering the spectral region from 3.35 to 3.48 eV, with UV/VIS rejection ratios up to ∼105 and responsivities as high as 185 A/W. Both the rejection ratio and the responsivity are shown to be largely enhanced by the presence of an internal gain mechanism, by which the compensated films become highly conductive as a result of illumination. This causes a large increase in the tunnel current through the Schottky barrier, yielding internal gains that are a function of the incident photon flux. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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