DIODE AND POWER CONVERTOR USING THE SAME
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United States of America Patent
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Apr 24, 2017
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May 2, 2016
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Abstract
A diode includes an anode electrode layer; a cathode electrode layer; a buffer layer of a first conductivity type formed between the anode electrode layer and the cathode electrode layer in a region extending to a location at a distance of 30 μm or more from the cathode electrode layer; a first semiconductor layer of the first conductivity type formed in a region between the anode electrode layer and the cathode electrode layer, and being in contact with the buffer layer of the first conductivity type; and a second semiconductor layer of a second conductivity type formed in a region between the anode electrode layer and the first semiconductor layer of the first conductivity type. The carrier concentration in the first semiconductor layer is lower than the carrier concentration in the buffer layer. The carrier concentration in the buffer layer is less than 1×1015 cm−3.
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