Electron beam apparatus
First Claim
1. A charged particle beam apparatus which employs a scanning electron microscope for sample inspection and defect review, comprising:
- a primary particle beam source for generating a primary particle beam, wherein the primary electron beam source has a ZrO/W field emission cathode (cathode);
an accelerating electrode (anode) for accelerating generated primary electron beam;
a beam limit aperture for adjusting preferred probe current;
a condenser lens to condense the primary particle beam;
a beam tube with a positive bias to ground potential to guide primary beam toward sample to be inspected;
a SORIL type objective lens system for focusing the primary electron beam into an electron beam probe;
a sample to be inspected with a negative bias to ground potential; and
a detection system for detecting secondary electrons and x-ray emanating from sample upon being impinged by the electron beam probe.
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Abstract
The present invention relates to a charged particle beam apparatus which employs a scanning electron microscope for sample inspection and defect review.
The present invent provides solution of improving imaging resolution by utilizing a field emission cathode tip with a large tip radius, applying a large accelerating voltage across ground potential between the cathode and anode, positioning the beam limit aperture before condenser lens, utilizing condenser lens excitation current to optimize image resolution, applying a high tube bias to shorten electron travel time, adopting and modifying SORIL objective lens to ameliorate aberration at large field of view and under electric drifting and reduce the urgency of water cooling objective lens while operating material analysis.
The present invent provides solution of improving throughput by utilizing fast scanning ability of SORIL and providing a large voltage difference between sample and detectors.
84 Citations
20 Claims
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1. A charged particle beam apparatus which employs a scanning electron microscope for sample inspection and defect review, comprising:
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a primary particle beam source for generating a primary particle beam, wherein the primary electron beam source has a ZrO/W field emission cathode (cathode); an accelerating electrode (anode) for accelerating generated primary electron beam; a beam limit aperture for adjusting preferred probe current; a condenser lens to condense the primary particle beam; a beam tube with a positive bias to ground potential to guide primary beam toward sample to be inspected; a SORIL type objective lens system for focusing the primary electron beam into an electron beam probe; a sample to be inspected with a negative bias to ground potential; and a detection system for detecting secondary electrons and x-ray emanating from sample upon being impinged by the electron beam probe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification