CMP Polishing Composition Balancing Removal Rate and Pad Temperature
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Solution Overview
Problem
Conventional polishing compositions for high hardness materials like silicon carbide face challenges in achieving a high polishing removal rate while minimizing the increase in polishing pad temperature, which affects manufacturing efficiency and productivity.
Innovation Solution
A polishing composition containing abrasive particles, permanganate, and an aluminum salt, where specific concentration ratios and pH levels are optimized to balance polishing removal rate and pad temperature, including concentrations of permanganate (C1) and aluminum salt (C2) in relation to the abrasive content (W1), ensuring effective chemical and mechanical polishing actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a polishing composition containing a strong oxidant such as permanganate is used to improve polishing removal rate, then the polishing removal rate increases, but the material autolyzes during storage due to high activity
Solution Approach 1:
The patent introduces an aluminum salt as an intermediary substance that reacts with permanganate to form a complex. This complex acts as a mediator that provides controlled oxidizing activity during polishing while being more stable during storage. The aluminum salt moderates the high reactivity of permanganate, enabling both high polishing removal rate and improved storage stability.
Solution Approach 2:
The patent changes the chemical parameters of the polishing composition by controlling the concentration ratio of aluminum salt to permanganate (C2/C1 ≥ 0.04) and the concentration of permanganate relative to abrasive content (C1/W1 ≥ 500). These parameter changes optimize the balance between reactivity for high removal rate and stability for storage, transforming the composition from unstable to controllable.
2Productivity
If polishing conditions are intensified (increased load or platen rotation speed) to improve polishing removal rate, then productivity increases, but the temperature of the polishing pad increases significantly
Solution Approach 1:
The patent replaces purely mechanical polishing (relying on high load and rotation speed) with a chemical-mechanical hybrid approach. The permanganate-aluminum salt complex provides chemical oxidation that assists material removal, reducing the need for intense mechanical conditions. This substitution lowers frictional heating and polishing pad temperature while maintaining high removal rate.
3Productivity
If a polishing composition containing abrasive is used to improve polishing removal rate, then productivity increases, but the temperature increase of polishing pad becomes larger
Solution Approach 1:
The patent creates a composite polishing system combining abrasive particles with a chemical complex of permanganate and aluminum salt. This composite composition provides dual action: mechanical removal by abrasive and chemical oxidation by the complex. The chemical component reduces the mechanical load required, thereby reducing frictional heating and pad temperature increase while maintaining high removal rate.
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 optimized composition enhances polishing removal rate and reduces pad temperature, improving manufacturing efficiency and extending the preservation stability of the polishing composition.
Implementation Method 1
a polishing composition containing an abrasive (abrasive particles), permanganate, and an aluminum salt
Implementation Method 2
a polishing composition containing an abrasive (abrasive particles), permanganate, and an aluminum salt, wherein a relation of a content W1 [% by weight] of the abrasive, a concentration C1 [mM] of the permanganate, and a concentration C2 [mM] of the aluminum salt satisfies both of the following formulae (1) and (2)
Implementation Method 3
a polishing composition containing an abrasive (abrasive particles)
Data Source
AI summary
Provided is a polishing composition containing an abrasive, permanganate, an aluminum salt, and water. In the polishing composition, a relation of a content W1 [% by weight] of the abrasive, a concentration C1 [mM] of the permanganate, and a concentration C2 [mM] of the aluminum salt satisfies at least one condition of the following conditions [A], [B], and [C]:satisfying both of 500≤(C1/W1) and 0.04≤(C2/C1); [A]satisfying both of 200≤(C1/√(W1)) and 8≤C2; and [B]satisfying both of 500≤(C1/W1) and 8≤C2. [C]