Ceramic Sample Holder Surface Layout for Dielectric Breakdown Control
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Solution Overview
Problem
Existing sample holders for semiconductor wafers face challenges with dielectric breakdown and plasma leakage, which can lead to inefficiencies and damage during manufacturing processes.
Innovation Solution
A sample holder design featuring an insulating substrate with a heat element on its second surface, where the second surface includes a first portion with a heat element, a second portion surrounding it, and a groove between them, with the first portion having a greater surface roughness than the second portion to increase the creeping distance and reduce dielectric breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the heat element is placed close to the insulating substrate surface, then heating efficiency is improved, but dielectric breakdown and plasma leakage occur
Solution Approach 1:
The patent applies local quality by creating different surface roughness characteristics in different regions of the insulating substrate. The first portion (where plasma contact occurs) has a rougher surface with higher irregularities, while the second portion has a smoother surface. This local differentiation allows the rough first portion to increase the creeping distance and prevent dielectric breakdown, while maintaining effective heating through the smoother second portion.
Solution Approach 2:
The patent transitions from a two-dimensional surface problem to a three-dimensional solution by creating surface roughness features. The rough surface introduces vertical irregularities and depth variations that extend the plasma path length (creeping distance) without increasing the horizontal distance between the heat element and substrate. This dimensional approach effectively increases the breakdown voltage path while maintaining compact heater-substrate spacing for efficient heating.
2Reliability
If the surface is made rough to increase creeping distance, then dielectric breakdown is reduced, but manufacturing precision of the insulating substrate decreases
Solution Approach 1:
The patent resolves this contradiction by applying different surface quality requirements to different functional regions. The first portion has intentionally roughened surface with higher irregularities to maximize creeping distance and prevent breakdown. The second portion maintains smoother surface finish for manufacturing precision and proper heat element contact. This localized approach allows each region to have the surface characteristics optimized for its specific function.
Solution Approach 2:
The insulating substrate surface is segmented into distinct functional zones: a first portion with rough surface texture for plasma interaction and breakdown prevention, and a second portion with smooth surface texture for heating and manufacturing precision. This segmentation allows independent optimization of each region's surface properties without compromising the other, resolving the conflict between roughness requirements and manufacturing precision.
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
The design effectively reduces dielectric breakdown and plasma leakage by increasing the creeping distance between the heat elements and the insulating substrate, thereby enhancing the reliability and efficiency of semiconductor wafer manufacturing processes.
Implementation Method 1
a heat element on the second surface of the insulating substrate
Implementation Method 2
A surface roughness of the first portion is greater than a surface roughness of the second portion... to increase the creeping distance and reduce dielectric breakdown
Data Source
AI summary
A sample holder includes an insulating substrate, a heat element, a support member, and a bond. The insulating substrate is a ceramic member having a first surface and a second surface opposite to the first surface. The heat element is on the second surface of the insulating substrate. The second surface of the insulating substrate includes a first portion where the heat element is located, a second portion surrounding the first portion, and a groove between the first portion and the second portion. A surface roughness of the first portion is greater than a surface roughness of the second portion.