Patent ID: 8178365
Filing Date: 2012-05-15
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: preparing a semiconductor wafer including a plurality of first semiconductor elements each having a first prescribed ON voltage and a plurality of second semiconductor elements each having a second prescribed ON voltage and an area smaller than that of said first semiconductor element formed on a surface thereof; forming recombination centers in said first semiconductor elements and said second semiconductor elements by emitting prescribed radioactive rays or prescribed ions all over said surface of said semiconductor wafer; and measuring said second prescribed ON voltages of said second semiconductor elements and recovering lifetimes, defined in said first semiconductor elements and said second semiconductor elements based on the formation of said recombination centers, by subjecting said semiconductor wafer to a prescribed annealing treatment, an annealing treatment amount in said annealing treatment being controlled based on said measured second prescribed ON voltages of said second semiconductor elements, such that all of the first prescribed ON voltages of said first semiconductor elements are equal to a predetermined ON voltage when said lifetimes of said first semiconductor elements are recovered.