Patent ID: 6979824
Filing Date: 2005-12-27
Classification: H01J

Abstract:
1. A method for examining a specimen with a high aspect ratio feature, the method comprising: impinging a primary beam onto an area of the specimen with the high aspect ratio feature; extracting scattered electrons that are generated due to the impingement of the primary beam onto the specimen; applying a filter to remove the scattered electrons with characteristics outside of a selected filter range; and detecting the scattered electrons with characteristics inside of the selected filter range to generate image data relating to the high aspect ratio feature, wherein the filter comprises an energy filter, wherein the filter range comprises an energy range, and wherein applying the energy filter removes the scattered electrons with energies outside the energy range, and wherein the energy range comprises energies below a threshold energy, and wherein the threshold energy is set to an approximate potential difference from a bottom of the high aspect ratio feature to a surface of the area surrounding the feature.