Patent ID: 9239299
Filing Date: 2016-01-19
CPC Classification: G01N,G01R,H01L

Claim Text:
1. A photoinduced carrier lifetime measuring method comprising: irradiating, by a microwave source, a microwave onto a semiconductor substrate while periodically pulse-irradiating, by an irradiating light source, a light onto the semiconductor substrate; detecting, by a detector, the microwave transmitted through the semiconductor substrate or reflected by the semiconductor substrate; and obtaining, by calculating circuitry, the effective lifetime of photoinduced carriers generated in the semiconductor substrate by the pulse irradiation of the light, based on an irradiation duration T wherein the light pulse irradiation is performed plural times, each with a changed irradiation duration T the measuring method further comprising: detecting, by the detector, the microwave for each of the plural times of pulse irradiation; and obtaining, by the calculating circuitry, the effective lifetime of the photoinduced carriers generated in the semiconductor substrate by the light, based on each irradiation duration T wherein the detection of the microwave is performed in the non-irradiation duration T wherein the effective lifetime of the photoinduced carriers generated in the semiconductor substrate by the light is obtained based on the relation between the irradiation duration T