Precisely Shaped Abrasive Features for Stable CMP Pad Conditioning
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Solution Overview
Problem
Conventional abrasive articles for CMP processes face challenges in independently controlling polishing pad wear rate and surface finish, leading to inconsistent performance and increased cost of ownership, especially with soft and easily conditioned pads.
Innovation Solution
Abrasive articles with controlled areal density and height offset between primary and secondary abrasive features, allowing independent modulation of polishing pad wear rate and surface roughness, featuring monolithic abrasive elements with precise shapes and coatings, aligned to maintain consistent CMP performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional abrasive articles are used for CMP processes, then polishing pad wear rate and surface finish can be achieved, but independent control of these parameters is difficult leading to inconsistent performance
Solution Approach 1:
The abrasive article is segmented into multiple abrasive elements, each element having multiple abrasive features with different height levels (primary, secondary, tertiary features). This segmentation allows different height levels to perform different functions: primary features control wear rate while secondary and tertiary features control surface finish, enabling independent control of these parameters and consistent performance.
Solution Approach 2:
Different regions of the abrasive article have different areal densities of abrasive features. By varying the local density of abrasive features at different height levels across different areas of the polishing pad, the invention enables spatially differentiated control of wear rate and surface finish, achieving both parameters independently and consistently.
2Duration of action of stationary object
If conventional abrasive articles are used, then CMP operation can be performed, but pad wear rate decays quickly and lifetime is limited
Solution Approach 1:
The abrasive features are pre-configured in multiple height levels before contacting the polishing pad. The primary features (tallest) engage first to establish initial wear patterns, while secondary and tertiary features (shorter) follow to maintain consistent wear rates. This preliminary structuring ensures stable wear rate decay and extends pad lifetime while maintaining productivity.
Solution Approach 2:
The invention changes the parameter of abrasive feature height distribution by implementing a multi-level height structure with controlled areal densities. This parameter change transforms the wear mechanism from rapid decay to controlled, stable decay, extending polishing pad lifetime while maintaining consistent removal rates throughout the pad's service life.
3Manufacturing precision
If abrasive features with high areal density are used, then surface finish can be improved, but polishing pad wear rate increases excessively
Solution Approach 1:
The abrasive features are segmented into multiple height levels (primary, secondary, tertiary) with different areal densities. By segregating features of different heights, the invention allows taller primary features to control wear rate at lower areal density while shorter secondary and tertiary features control surface finish at higher areal density, thus improving surface roughness control without excessively increasing polishing pad wear.
Solution Approach 2:
Different height levels of abrasive features are assigned different areal densities optimized for their specific functions. Taller primary features use lower areal density to control wear rate, while shorter secondary and tertiary features use higher areal density to control surface finish. This local quality differentiation resolves the contradiction between surface roughness control and polishing pad wear.
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 abrasive articles provide a slower pad wear rate decay and improved surface finish consistency, reducing defects and debris, while maintaining high removal rates and extending polishing pad lifetime.
Implementation Method 1
abrasive features disposed on one or more abrasive elements... Each of the one or more abrasive elements includes a base having a first major surface from which the plurality of abrasive features extends
Data Source
AI summary
An abrasive article includes a plurality of abrasive features disposed on one or more abrasive elements. Each of the one or more abrasive elements includes a base having a first major surface from which the plurality of abrasive features extends. A first set of the plurality of abrasive features (i) has an average height, H1avg, (ii) a standard deviation of less than 10% of H1avg, and (iii) comprises between 5 and 130 abrasive features.