CMP Pad Conditioner with Mixed Protrusion Heights
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Solution Overview
Problem
Conventional pad conditioners for CMP devices fail to control surface roughness effectively, leading to slurry hardening and scratches on wafer surfaces due to uncontrolled protrusions, and they cannot meet the increased demands for uniformity and performance in miniaturized semiconductor processes.
Innovation Solution
A pad conditioner with a substrate and protruding members having cutting parts of varying heights, supported by a roughness control part and body part, arranged in specific configurations to minimize roughness and indentation depth, and coated with a diamond layer for enhanced polishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conditioners are used to cut the pad surface, then the pad can be conditioned to restore polishing performance, but the surface roughness increases and scratches are formed on the wafer surface
Solution Approach 1:
The conditioner employs protruding members with different heights (first, second, and third protruding members) to provide localized cutting actions at different depths. This local differentiation allows controlled cutting in specific areas while minimizing overall surface roughness and preventing scratches on the wafer surface.
Solution Approach 2:
The conditioner is divided into multiple functional protruding members (first, second, and third protruding members) with distinct heights and cutting characteristics. This segmentation enables independent control of cutting intensity and depth, allowing restoration of polishing performance while minimizing harmful surface effects.
2Productivity
If the cutting part protrudes more to enhance cutting ability, then the conditioning effect is improved, but the indentation depth increases causing more roughness
Solution Approach 1:
Different regions of the conditioner have different protrusion heights tailored to specific functions. The first protruding member has greater height for stronger cutting in certain areas, while the second and third protruding members provide milder cutting effects, creating local quality variations that balance conditioning efficiency with surface uniformity.
Solution Approach 2:
The conditioner applies partial cutting action through multiple protruding members with varying heights rather than one uniformly high cutting element. This partial action approach maintains conditioning effectiveness while preventing excessive indentation depth that would cause surface roughness.
3Device complexity
If a single type of protruding member is used, then the device structure is simple, but the performance uniformity between products decreases
Solution Approach 1:
The conditioner incorporates multiple types of protruding members with different heights and cutting characteristics distributed across the surface. This local quality differentiation ensures uniform performance across different regions and products while maintaining a relatively simple overall structure that can be manufactured consistently.
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 solution effectively reduces roughness and performance deviation between products by controlling indentation depth and maintaining consistent polishing performance, minimizing the risk of scratches and extending the pad conditioner's lifespan.
Implementation Method 1
a coating layer formed on a surface of the protruding member
Data Source
AI summary
A pad conditioner configured to dress a surface of a chemical mechanical polishing (CMP) pad according to an embodiment of the present invention may include a substrate, and a protruding member including a cutting part configured to cut the pad, a roughness control part configured to support the cutting part and restrict an indentation depth of the cutting part, and a body part protruding from the substrate and configured to support the roughness control part and provided in plural on the substrate, wherein the cutting parts may have different protrusion heights, and a protruding member including a cutting part with a relatively larger protrusion height and a protruding member including a cutting part with a relatively smaller protrusion height may be disposed mixedly at a set ratio.