Conductive Stage Coating Edge Geometry to Prevent SEM Arcing
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Solution Overview
Problem
Existing particle beam apparatuses, such as SEMs, face issues with electric field enhancement at the edges of conductive coatings, leading to cold field emission and arcing, which can damage samples and affect measurement accuracy.
Innovation Solution
The introduction of a feature, such as a groove or insulating material, on the surface of the table body near the edge of the conductive coating reduces electric field strength by modifying the geometry and eliminating electric triple junctions, thereby reducing electric field enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive coating is provided on the table body surface, then electrical conductivity is improved, but electric field enhancement occurs at the edges leading to cold field emission and arcing
Solution Approach 1:
The patent applies curvature by replacing the sharp edge geometry with a rounded or curved edge profile. The conductive coating edge is designed with a curved transition instead of an abrupt sharp edge, which distributes the electric field more uniformly and eliminates the field enhancement effect that causes cold field emission and arcing.
Solution Approach 2:
The patent applies local quality by providing different geometric characteristics at different locations. The central region of the conductive coating maintains its standard geometry for optimal conductivity, while the edge region specifically incorporates curved or rounded geometry to eliminate field enhancement, thus addressing the problem locally without compromising overall electrical conductivity.
2Manufacturing precision
If the conductive coating edge is made sharp for precise geometry, then manufacturing precision is improved, but electric field enhancement increases causing cold field emission
Solution Approach 1:
The patent replaces sharp edges with curved edges, maintaining geometric precision through controlled curvature rather than abrupt transitions. This curved geometry achieves the dual goal of manufacturing precision while eliminating the electric field enhancement that leads to cold field emission.
3Ease of operation
If voltage is applied to the conductive object and conductive coating, then electron beam control is improved, but arcing occurs due to high electric field strength at edges
Solution Approach 1:
The curved edge geometry distributes the electric field lines more uniformly across the conductive coating surface, preventing concentration of field strength at sharp edges. This eliminates the conditions for arcing while preserving the voltage control necessary for electron beam operation.
Solution Approach 2:
The patent applies different geometric properties to different regions: the main conductive surface maintains its standard properties for effective electron beam control, while the edge region specifically incorporates curved geometry to prevent arcing, thus resolving the contradiction locally.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively minimizes electric field enhancement, preventing cold field emission and arcing, thus protecting samples and improving measurement accuracy in particle beam apparatuses.
Implementation Method 1
the conductive coating (and portion of a surface of the table body on which a conductive coating is provided) may also be generally planar and may be arranged to be substantially parallel to the conductive object... the electric field strength in the vicinity of the silicon wafer when supported on the surface of the table body on which a conductive coating is provided
Implementation Method 2
Existing particle beam apparatuses, such as SEMs, face issues with electric field enhancement at the edges of conductive coatings, leading to cold field emission and arcing
Implementation Method 3
Existing particle beam apparatuses, such as SEMs, face issues with electric field enhancement at the edges of conductive coatings, leading to cold field emission and arcing
Data Source
AI summary
A stage apparatus for a particle-beam apparatus is disclosed. A particle beam apparatus may comprise a conductive object and an object table, the object table being configured to support an object. The object table comprises a table body and a conductive coating, the conductive coating being provided on at least a portion of a surface of the table body. The conductive object is disposed proximate to the conductive coating and the table body is provided with a feature proximate to an edge portion of the conductive coating. Said feature is arranged so as to reduce an electric field strength in the vicinity of the edge portion of the conductive coating when a voltage is applied to both the conductive object and the conductive coating.