Testing apparatus using charged particles and device manufacturing method using the testing apparatus
First Claim
1. An electron beam apparatus comprising:
- means for applying an electron beam to a sample;
means for macro-projecting electrons, which obtained information of the surface of said sample with application of said electron beam to said sample, to form an image on a detector; and
means for synthesizing as an image said electrons made to form an image on the detector,wherein the shape of the irradiation area in which said electron beam is applied to said sample is approximately symmetric with respect to two axes orthogonal to the optical axis of said electron beam,the illuminance of said electron beam in said irradiation area is uniform,said means for applying an electron beam and said means for forming an image are an optical system comprised of an electrostatic lens,said means for synthesizing comprises means for multiplying said electrons, means for converting said electrons multiplied by said multiplying means into light, and a TDI-CCD converting light from said means for converting electrons into light into electric signals for images, andthe voltage of said electrostatic lens is adjusted to determine a pixel size on the surface of said sample for obtaining a desired magnification of macro-projection based on the pixel size of said TDI-CCD.
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Abstract
A system for further enhancing speed, i.e. improving throughput in a SEM-type inspection apparatus is provided. An inspection apparatus for inspecting a surface of a substrate produces a crossover from electrons emitted from an electron beam source 25•1, then forms an image under a desired magnification in the direction of a sample W to produce a crossover. When the crossover is passed, electrons as noises are removed from the crossover with an aperture, an adjustment is made so that the crossover becomes a parallel electron beam to irradiate the substrate in a desired sectional form. The electron beam is produced such that the unevenness of illuminance is 10% or less. Electrons emitted from the sample W are detected by a detector 25•11.
94 Citations
13 Claims
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1. An electron beam apparatus comprising:
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means for applying an electron beam to a sample; means for macro-projecting electrons, which obtained information of the surface of said sample with application of said electron beam to said sample, to form an image on a detector; and means for synthesizing as an image said electrons made to form an image on the detector, wherein the shape of the irradiation area in which said electron beam is applied to said sample is approximately symmetric with respect to two axes orthogonal to the optical axis of said electron beam, the illuminance of said electron beam in said irradiation area is uniform, said means for applying an electron beam and said means for forming an image are an optical system comprised of an electrostatic lens, said means for synthesizing comprises means for multiplying said electrons, means for converting said electrons multiplied by said multiplying means into light, and a TDI-CCD converting light from said means for converting electrons into light into electric signals for images, and the voltage of said electrostatic lens is adjusted to determine a pixel size on the surface of said sample for obtaining a desired magnification of macro-projection based on the pixel size of said TDI-CCD. - View Dependent Claims (2, 3, 4, 5)
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- 6. The electron beam apparatus according to claim 6, wherein the pixel size of said TDI-CCD is a pixel size equal to or smaller than a value obtained by magnifying a design rule by a factor.
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8. An electron beam apparatus comprising:
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means for applying an electron beam to a sample; means for macro-projecting electrons, which obtained information of the surface of said sample with application of said electron beam to said sample, to form an image on a detector; and means for synthesizing as an image said electrons made to form an image on the detector, wherein the illuminance of said electron beam in said irradiation area is uniform, said means for forming an image is an optical system comprised of an electrostatic lens, means for separating said electron beam from said electrons is a deflector using an electric field and a magnetic field, the center of the image formed by macro-projection on said detector and the center of said electrostatic lens are on a common axis, and in a section between said deflector and said sample, said electron beam has said common axis as an optical axis, and said optical axis of said electron beam is approximately perpendicular to said sample. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification