Observing method and its apparatus using electron microscope
First Claim
1. An electron-beam observation apparatus comprising:
- a stage on which a to-be-observed target sample having a defect is placed, the defect being detected by an inspection apparatus beforehand, the stage moving at least in XY directions;
a first electro-optical system which irradiates by scanning a converged electron beam from a substantially perpendicular direction to the defect on the target sample to be observed, and outputs a defect image signal with perpendicular observation by detecting at least one of a secondary electron image and a reflected electron image which is generated from the defect by first electron detection means;
a second electro-optical system which irradiates by scanning a converged electron beam from a tilted direction to the defect on the target sample to be observed, and outputs a defect image signal with tilt observation by detecting at least one of a secondary electron image and a reflected electron image which is generated from the defect on the target sample to be observed by second electron detection means; and
a defect image signal acquisition unit which acquires the defect image signal with the perpendicular observation from the first electro-optical system, and the defect image signal with the tilt observation from the second electro-optical system.
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Abstract
The present invention relates to high-speed acquisition of both a perpendicular observation image and a tilt observation image, in observation using a scanning electron microscope. An electron-beam observation apparatus includes: a first electro-optical system which scans a converged electron beam from a substantially perpendicular direction to a defect on a target wafer to be observed, and acquires a defect image signal with perpendicular observation by detecting a secondary electron image or a reflected electron image generated from the defect; and a second electro-optical system which scans a converged electron beam from a tilt direction to the defect, and acquires a defect image signal with tilt observation by detecting a secondary electron image or a reflected electron image generated from the defect.
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Citations
17 Claims
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1. An electron-beam observation apparatus comprising:
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a stage on which a to-be-observed target sample having a defect is placed, the defect being detected by an inspection apparatus beforehand, the stage moving at least in XY directions;
a first electro-optical system which irradiates by scanning a converged electron beam from a substantially perpendicular direction to the defect on the target sample to be observed, and outputs a defect image signal with perpendicular observation by detecting at least one of a secondary electron image and a reflected electron image which is generated from the defect by first electron detection means;
a second electro-optical system which irradiates by scanning a converged electron beam from a tilted direction to the defect on the target sample to be observed, and outputs a defect image signal with tilt observation by detecting at least one of a secondary electron image and a reflected electron image which is generated from the defect on the target sample to be observed by second electron detection means; and
a defect image signal acquisition unit which acquires the defect image signal with the perpendicular observation from the first electro-optical system, and the defect image signal with the tilt observation from the second electro-optical system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electron-beam observation apparatus comprising:
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a stage on which a to-be-observed target sample having a defect is placed, said defect being detected by an inspection apparatus beforehand, said stage moving at least in XY directions;
a first electro-optical system which irradiates by scanning a converged electron beam from a substantially perpendicular direction to the defect on the target sample to be observed, and outputs a defect image signal with perpendicular observation at high magnification by detecting by first electron detection means at least one of a secondary electron image and a reflected electron image which is generated from the defect on the target sample to be observed;
a second electro-optical system which irradiates by scanning a converged electron beam from a tilted direction to the defect on the target sample to be observed, and outputs a defect image signal with tilt observation at high magnification by detecting by second electron detection means at least one of a secondary electron image and a reflected electron image which is generated from the defect on the target sample to be observed;
a defect image acquisition unit which acquires the defect image signal with the perpendicular observation at high magnification from the first electro-optical system, and acquires the defect image signal with the tilt observation at high magnification from the second electro-optical system; and
a defect classification unit which classifies a kind of the defect on the basis of the defect image signal with the perpendicular observation at the high magnification and the defect image signal with the tilt observation at the high magnification, which have been acquired by the defect image acquisition unit. - View Dependent Claims (10)
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11. An observing method using an electron-beam observation apparatus, the observing method comprising the steps of:
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irradiating by scanning a converged electron beam from a substantially perpendicular direction to a defect on a target sample to be observed, the defect being detected by an inspection apparatus beforehand;
detecting a secondary electron and/or a reflected electron which is generated from the defect on the target sample to be observed by irradiating the converged electron beam from the substantially perpendicular direction, by a first electron detection means;
acquiring a defect image signal with perpendicular observation, from a signal detected the secondary electron and/or the reflected electron by the first electron detection means;
irradiating by scanning a converged electron beam from a tilt direction to the defect on the target sample to be observed, the defect being detected by the inspection apparatus beforehand;
detecting a secondary electron and/or a reflected electron which is generated from the defect on the target sample to be observed by irradiating the converged electron beam from the tilt direction, by a second electron detection means;
acquiring a defect image signal with tilt observation, from a signal detected the secondary electron and/or the reflected electron by the second electron detection means; and
displaying the defect image signal with the perpendicular observation and the defect image signal with the tilt observation on same screen. - View Dependent Claims (12, 13)
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14. An observing method using an electron-beam observation apparatus, said observing method comprising the steps of:
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acquiring a defect image of first magnification with perpendicular observation by scanning and irradiating a converged electron beam from a substantially perpendicular direction to a first area including a defect on a target sample to be observed, the defect being detected by an inspection apparatus beforehand, and by detecting a secondary electron and/or a reflected electron which is generated from the first area;
acquiring a defect image of second magnification being higher than the first magnification with the perpendicular observation by scanning and irradiating the converged electron beam from the substantially perpendicular direction to a second area including the defect, the second area being narrower than the first area, and by detecting a secondary electron and/or a reflected electron which is generated from the second area;
acquiring a defect image of third magnification with tilt observation by scanning and irradiating a converged electron beam from tilt direction to a third area including the defect, and by detecting a secondary electron and/or a reflected electron which is generated from the third area; and
displaying the defect image signal of the second magnification with the perpendicular observation and the defect image signal of the third magnification with the tilt observation, on same screen. - View Dependent Claims (15, 16, 17)
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Specification