Patent ID: 8604432
Filing Date: 2013-12-10
Classification: H01J

Abstract:
1. A defect inspection apparatus comprising: a charged beam irradiation unit configured to generate a charged beam and irradiate a sample comprising a pattern as an inspection target thereon with the generated charged beam; a detection unit configured to detect secondary charged particles or reflected charged particles generated from the sample by irradiation of the charged beam and to output a signal; an energy filter located between the detection unit and the sample, the energy filter being configured to selectively allow the secondary charged particles or the reflected charged particles with energy associated with an applied voltage to pass therethrough; and an inspection unit configured to apply voltages different from each other to the energy filter and output information concerning a defect of the pattern from an intensity difference between signals obtained under application voltage different from each other and wherein a plurality of pairs of the energy filter and the detection unit are provided.