Patent ID: 8625085

Claim:
A defect evaluation method comprising the steps of: applying direct-current voltage between a first electrode and a second electrode of a sample; repeating a first step; the first step comprising: irradiating the sample with light to generate photoexcited carriers in a semiconductor film of the sample, and detecting a value of current flowing between the first electrode and the second electrode; and blocking the light, and performing treatment to reduce the photoexcited carriers; changing an amount of the light so that the value of the current is within a certain range of a given value after the first step; repeating a second step after the changing step; the second step comprising: irradiating the sample with the light to generate photoexcited carriers in the semiconductor film of the sample, and detecting a value of current flowing between the first electrode and the second electrode; and blocking the light, and performing the treatment to reduce the photoexcited carriers; and recording a wavelength of the light and the amount of the light after the value of the current is within the certain range of the given value, wherein the sample includes the first electrode and the second electrode over a semiconductor, an insulating film below the semiconductor, and a third electrode below the insulating film.