Optically enhanced mobility in a persistent photoconduction state

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Abstract
Illumination enhances the carrier mobility in semiconductors within the regime of impurity scattering because the excess photogenerated electron-hole pairs screen the ionized impurities. Quantitative agreement with the Brooks-Herring theory is shown to be possible only by proper consideration of the persistent-photoconductivity phenomenon, which leads to a widening of the conductive layer in epitaxial material.

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