Electron beam apparatus and device manufacturing method using same
First Claim
1. An electron beam apparatus comprising:
- an electron beam source for irradiating a sample with a primary electron beam, said sample including a pattern structure on the surface consisting of complex materials including a mixture of a metal and an insulating material;
a detector for detecting secondary electrons emitted from the surface of said sample irradiated with the primary electron beam; and
an image processing system for processing a signal from said detector to compare an image with adjacent image and form an electron image, thereby detecting defects;
wherein said primary electron beam is optimized to have a beam energy in a range of 2 to 4 keV, thereby reducing a secondary electron emission efficiency from the sample to less than one and causing the sample to be negatively charged, and wherein said electron beam source illuminates the sample to reduce potential difference between said metal material and insulating material.
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Abstract
A defect inspecting apparatus is provided for generating a less distorted test image to reliably observe a surface of a sample for detecting defects thereon. The defect detecting apparatus comprises a primary electron beam source for irradiating a sample, electrostatic lenses for focusing secondary electrons emitted from the surface of the sample irradiated with the primary electron beam, a detector for detecting the secondary electrons, and an image processing unit for processing a signal from the detector. Further, a second electron source may be provided for emitting an electron beam irradiated to the sample, wherein the sample may be irradiated with the electron beam from the second electron source before it is irradiated with the primary electron beam from the first electron source for observing the sample. A device manufacturing method is also provided for inspecting devices under processing with high throughput using the defect detecting apparatus.
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Citations
16 Claims
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1. An electron beam apparatus comprising:
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an electron beam source for irradiating a sample with a primary electron beam, said sample including a pattern structure on the surface consisting of complex materials including a mixture of a metal and an insulating material; a detector for detecting secondary electrons emitted from the surface of said sample irradiated with the primary electron beam; and an image processing system for processing a signal from said detector to compare an image with adjacent image and form an electron image, thereby detecting defects; wherein said primary electron beam is optimized to have a beam energy in a range of 2 to 4 keV, thereby reducing a secondary electron emission efficiency from the sample to less than one and causing the sample to be negatively charged, and wherein said electron beam source illuminates the sample to reduce potential difference between said metal material and insulating material. - View Dependent Claims (2, 12, 15, 16)
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3. An electron beam apparatus comprising:
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an electron beam source for irradiating a sample with a primary electron beam, said sample including a pattern structure on the surface consisting of complex materials including a mixture of a metal and an insulating material; a detector for detecting secondary electrons emitted from the surface of said sample irradiated with the primary electron beam; and an image processing system for processing a signal from said detector to compare an image with adjacent image and form an electron image, thereby detecting defects; wherein said primary electron beam is optimized to have a beam energy in a range of 2 to 4 KeV to negatively charge an insulating material on the surface of said sample to reduce overcharging, and wherein said electron beam source illuminates the sample to reduce potential difference between samples on a wafer. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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13. A method of detecting defects on a sample for classification and discrimination, comprising the steps of:
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irradiating said sample with an electron beam emitted from an electron beam source, said sample including a pattern structure on the surface consisting of complex materials such as a mixture of a metal and an insulating material; imaging secondary electrons emitted from the surface of said sample irradiated with the primary electron beam; detecting said secondary electrons by a detector; and processing a signal from said detector to compare an image with adjacent one and form an electron image, thereby detecting defects; wherein said primary electron beam is optimized to have a beam energy in a range of 2 to 4 keV, thereby reducing a secondary electron emission efficiency from the sample to less than one and causing the sample to be negatively charged, and wherein said electron beam source illuminates the sample to reduce potential difference between said metal material and insulating material.
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14. A method of detecting defects on a sample, comprising the steps of:
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irradiating said sample with a primary electron beam emitted from an electron beam source, said sample including a pattern structure on the surface consisting of complex materials including a mixture of a metal and an insulating material; focusing secondary electrons emitted from the surface of said sample irradiated with the primary electron beam; detecting said secondary electrons by a detector; and processing a signal from said detector to compare an image with adjacent one and form an electron image, thereby detecting defects; wherein said primary electron beam is optimized to have a beam energy in a range of 2 to 4 KeV to negatively charge an insulating material on the surface of said sample to reduce overcharging, and wherein said electron beam source illuminates the sample to reduce potential difference between said metal material and insulating material.
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Specification