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High resolution three-dimensional doping profiler

United States Patent

December 21, 1999
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A semiconductor doping profiler provides a Schottky contact at one surface and an ohmic contact at the other. While the two contacts are coupled to a power source, thereby establishing an electrical bias in the semiconductor, a localized light source illuminates the semiconductor to induce a photocurrent. The photocurrent changes in accordance with the doping characteristics of the semiconductor in the illuminated region. By changing the voltage of the power source the depth of the depletion layer can be varied to provide a three dimensional view of the local properties of the semiconductor.
Thundat; Thomas G. (Knoxville, TN), Warmack; Robert J. (Knoxville, TN)
Lockheed Martin Energy Research Corporation (Oakridge, TN)
08/ 916,345
August 22, 1997
This invention was made with government support under Contract No. DE-AC05-840R21400 awarded by the U.S. Department of Energy to Martin Marietta Energy Systems, Inc. and the government has certain rights in this invention.