Substrate inspecting apparatus, substrate inspecting system having the same apparatus and substrate inspecting method
First Claim
1. A substrate inspecting apparatus comprising:
- primary electron beam irradiating means for irradiating a substrate defined as a sample with electron beams as primary electron beams;
projection means for guiding secondary electrons and reflected electrons generated on said substrate upon the irradiation of the primary electron beams, converging those electrons into secondary electron beams, and forming an image of the converged secondary electron beams;
electron beam separating means for separating the secondary electron beams on the basis of energy components corresponding to electric states on the surface of said sample, and fetching the separated electron beams;
electron beam detecting means for detecting the secondary electron beam, separated by said electron beam separating means, of which the image is then formed by said projection means, and outputting the detected secondary electron beam as an image signal; and
image displaying means for, upon receiving the image signal from said secondary electron beam detecting means, displaying an image indicating a physical/electrical state on the surface of said substrate.
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Accused Products
Abstract
A substrate inspecting system 60 observes and inspect a semiconductor wafer pattern by irradiating the surface of the semiconductor wafer 11 with electron beams 31, and making a projection unit project in enlargement secondary electrons, reflected electrons and backward scattered electrons generated therefrom in the form of secondary electron beams 32 on an undersurface of an electron beam detecting unit 61, and form an image thereon. The substrate inspecting system 60 includes a parallel-plate type energy filter 33 in a projection system. The present invention discloses a substrate inspecting apparatus capable of detecting a voltage contrast defect on a sample with a high accuracy by separating the secondary electron beams and fetching a secondary electron beam having an energy over a predetermined value, and of quantitatively measuring this defect, a substrate inspecting system having this apparatus, and a substrate inspecting method.
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Citations
16 Claims
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1. A substrate inspecting apparatus comprising:
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primary electron beam irradiating means for irradiating a substrate defined as a sample with electron beams as primary electron beams; projection means for guiding secondary electrons and reflected electrons generated on said substrate upon the irradiation of the primary electron beams, converging those electrons into secondary electron beams, and forming an image of the converged secondary electron beams; electron beam separating means for separating the secondary electron beams on the basis of energy components corresponding to electric states on the surface of said sample, and fetching the separated electron beams; electron beam detecting means for detecting the secondary electron beam, separated by said electron beam separating means, of which the image is then formed by said projection means, and outputting the detected secondary electron beam as an image signal; and image displaying means for, upon receiving the image signal from said secondary electron beam detecting means, displaying an image indicating a physical/electrical state on the surface of said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A substrate inspecting method comprising:
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a first step of irradiating a substrate defined as a sample with electron beams as primary electron beams; a second step of, guiding secondary electrons and reflected electrons generated on said substrate upon the irradiation of the primary electron beams, and making those electrons emerged as secondary electron beams; a third step of separating the secondary electron beams on the basis of energy regions, and fetching the separated electron beams; a fourth step of forming an image of the secondary electron be fetched based on said third step, and detecting and outputting mapping thereof as an image signal; and a fifth step of examining a physical/electric characteristic on the surface of said substrate on the basis of the image signal. - View Dependent Claims (9, 10)
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11. A substrate inspecting system comprising:
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(1) a substrate inspecting apparatus including; (a) primary electron beam irradiating means for irradiating a substrate defined as a sample with electron beams as primary electron beams; (b) projection means for guiding secondary electrons and reflected electrons generated on said substrate upon the irradiation of the primary electron beams, converging those electrons into secondary electron beams, and forming an image of the converged secondary electron beams; (c) electron beam separating means for separating the secondary electron beams on the basis of energy components corresponding to electric states on the surface of said sample, and fetching the separated electron beams; (d) electron beam detecting means for detecting the secondary electron beam, separated by said electron beam separating means, of which the image is then formed by said projection means, and outputting the detected secondary electron beam as an image signal; and (e) image displaying means for, upon receiving the image signal from said secondary electron beam detecting means, displaying an image indicating a physical/electrical state on the surface of said substrate; and (2) a CPU including; (a) signal processing means for processing the image signals; and (b) storage means for storing image data outputted by said signal processing means, wherein said CPU controls said substrate, said signal processing means and said storage means in accordance with a first step of irradiating a substrate defined as a sample with electron beams as primary electron beams;
a second step of, guiding secondary electrons and reflected electrons generated on said substrate upon the irradiation of the primary electron beams, and making those electrons emerged as secondary electron beams;
a third step of separating the secondary electron beams on the basis of energy regions, and fetching the separated electron beams;
a fourth step of forming an image of the secondary electron beams fetched based on said third step, and detecting and outputting mapping thereof as an image signal; and
a fifth step of examining a physical/electric characteristic on the surface of said substrate on the basis of the image signal. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification