The round robin test was conducted, in order to check the deviation of lifetime errors by microwave photoconductive decay (µ -PCD) method. The samples were CZ thermally oxidized wafers of p- and n-type. Two resistivity values were set between 3 Ω cm and 47 Ω cm and three lifetime levels between 2 µ s and 1500 µ s, and total 12 kinds of wafers were characterized in the round robin test. 19 organizations joined the test. The center value of the standard deviation of primary mode lifetime errors was 11.8% for an injected photon density of 5×1013 photons/cm2.
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