CMP Pad Conditioner with Segmented Diamond Tips
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Solution Overview
Problem
Conventional CMP pad conditioners experience unstable pad wear rates (PWR) due to variations in slurry type, pad material, and pressure changes, requiring numerous tests to optimize performance and leading to reduced productivity and shorter pad life.
Innovation Solution
A CMP pad conditioner with cutting tips having a substrate and a diamond layer, where the average pressure applied to each tip is controlled between 0.001 and 0.2 lbf/cu2/ea, and the size and number of tips are determined to maintain consistent PWR and extend service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional CMP pad conditioners are used with varying slurry types, pad materials, and pressure conditions, then the conditioner must be re-evaluated and re-optimized for each condition, but this leads to numerous tests being required and reduces productivity
Solution Approach 1:
The invention controls the average pressure applied to each cutting tip within a specific range (0.001 to 0.2 lbf/cu2/ea) and maintains the top surface of cutting tips parallel to the substrate surface. These parameter controls enable the conditioner to maintain stable PWR across different slurry types, pad materials, and pressure conditions, eliminating the need for extensive re-evaluation and re-optimization tests for each condition combination.
2Ease of manufacture
If diamond particles are attached regardless of orientation in conventional conditioners, then it is difficult to control the height of diamond protrusion, but this makes it impossible to equivalently control the contact area and predict pressure distribution
Solution Approach 1:
The invention segments the cutting tips into discrete units with controlled geometry, where each tip has a top surface area within a specific range (25 to 10000 μm2). By controlling the segmentation and geometry of individual cutting tips rather than relying on random diamond particle orientation, the invention achieves equivalent contact area control and predictable pressure distribution while maintaining manufacturing feasibility.
3Device complexity
If the same CMP pad conditioner is used across different slurry types and pad materials, then device complexity is reduced, but the pad wear rate becomes unstable and requires numerous tests to optimize
Solution Approach 1:
The invention establishes specific parameter ranges for cutting tip top surface area (25 to 10000 μm2) and average pressure (0.001 to 0.2 lbf/cu2/ea) that enable a single conditioner design to maintain stable PWR across different slurry types and pad materials. This parameter optimization allows one conditioner to reliably perform across multiple conditions without requiring complex specification variations.
4Stress or pressure
If cutting tips have large top surface area, then the pressure per tip is reduced, but this may require more tips to achieve the same conditioning effect
Solution Approach 1:
The invention optimizes the cutting tip top surface area within the range of 25 to 10000 μm2 to achieve an optimal balance between pressure distribution and tip quantity. This parameter optimization ensures that the average pressure per tip remains within the effective range (0.001 to 0.2 lbf/cu2/ea) while using a practical number of tips, avoiding both excessive pressure concentration and unnecessary proliferation of tip count.
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 enables stable PWR under varying conditions, reduces the number of required tests, and prolongs pad life by maintaining consistent pad roughness and wear rate, enhancing productivity and product quality.
Implementation Method 1
using a pad conditioner having a grinder such as diamond which is put in contact with the polishing pad to scrape or rub the surface of the polishing pad
Implementation Method 2
a cutting part comprising a diamond layer formed by depositing diamond onto the protrusions using CVD
Data Source
AI summary
This invention relates to a conditioner for a CMP (Chemical Mechanical Polishing) pad, which is used in a CMP process which is part of the fabrication of a semiconductor device, and more particularly, to a CMP pad conditioner in which the structure of the cutting tips is such that the change in the wear of the polishing pad is not great even when different kinds of slurry are used and when there are changes in pressure of the conditioner, and to a method of manufacturing the same.