Patent ID: 8759763
Filing Date: 2014-06-24
Classification: G01B,G01N,G06T,H01J

Abstract:
1. A method of measuring a step height of a device using a scanning electron microscope (SEM), the method comprising: providing a device which comprises a first region and a second region, wherein a step is formed between the first region and the second region; obtaining a plurality of SEM images of the device at varying focal lengths by photographing the device using a SEM, wherein the SEM image comprises a first SEM image region for the first region and a second SEM image region for the second region; converting the SEM images into a gray-level histogram and calculating a first peak value related to the first SEM image region and a second peak value related to the second SEM image region, wherein the first peak value and the second peak value are repeatedly calculated at varying focal lengths of the SEM; and determining a height of the step by analyzing a trend of changes in the first peak value according to changes in the focal length and a trend of changes in the second peak value according to the changes in the focal length.