Radiation assisted electrostatic separation of semiconductor materials
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United States of America Patent
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Mar 22, 2016
Grant Date -
Sep 20, 2012
app pub date -
Mar 18, 2011
filing date -
Mar 18, 2011
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Abstract
A method of separating material includes providing a mixture of a first material, such as a semiconductor, and a second material, such as an insulator or a different semiconductor. The mixture can be irradiated using a light source at a wavelength that causes the first material's conductivity to increase while leaving the second material's conductivity (substantially) unchanged. Placing the mixture in contact with a ground electrode discharges the first material but not the second material due to the difference in their conductivities. Applying an electric field to the discharged mixture separates the discharged first material from the second material.
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