SiC CMP Slurry Composition for Uniform Coverage and Low Scratches
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Solution Overview
Problem
Existing CMP methods for silicon carbide semiconductor devices face challenges in achieving uniform substrate coverage and effective material removal while minimizing surface scratches and roughness due to narrow particle distribution in polishing compositions.
Innovation Solution
A CMP composition comprising a permanganate component and particles with a width percentage (WIP) less than 500, which promotes uniform substrate coverage and enhances oxidation of SiC bonds, improving polishing rates and surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a narrow particle distribution is used in CMP composition, then the composition properties are easier to control, but the substrate coverage becomes non-uniform and material removal efficiency decreases
Solution Approach 1:
The patent changes the particle size distribution parameter from narrow to broad distribution (WIP less than 500) to achieve uniform substrate coverage and improved material removal efficiency while maintaining compositional control through specific permanganate content (at least 5% by weight)
Solution Approach 2:
The patent creates a composite CMP composition combining particles with broad size distribution and permanganate component, where the combination of different particle sizes works synergistically to provide both uniform coverage and effective material removal on silicon carbide substrates
2Productivity
If a broad particle distribution is used in CMP composition, then material removal rate and surface quality improve, but the composition becomes more complex to manufacture
Solution Approach 1:
The patent optimizes the permanganate content parameter to at least 5% by weight of the composition, which enhances oxidation of SiC bonds and improves material removal rate without requiring complex manufacturing processes for achieving broad particle distribution
3Manufacturing precision
If conventional CMP composition is used, then the polishing process is simpler, but surface scratches and roughness increase
Solution Approach 1:
The patent modifies the chemical composition parameter by incorporating at least 5% permanganate component, which enhances oxidation capability and reduces surface scratches and roughness during silicon carbide polishing
Solution Approach 2:
The patent employs permanganate component as a strong oxidant that accelerates the oxidation of silicon carbide bonds, improving material removal efficiency and surface quality by reducing scratches and roughness during the polishing process
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 composition achieves higher material removal rates and reduced surface scratches by uniformly covering the substrate, resulting in improved surface quality and increased polishing efficiency.
Implementation Method 1
the plurality of particles having a width percentage (WIP) less than 500 to achieve high polishing rates during silicon carbide CMP
Data Source
AI summary
Compositions, systems, and related methods for chemical mechanical planarization (CMP) polishing of silicon carbide substrates. A composition comprises at least 5% by weight of a permanganate component based on a total weight of the composition and a plurality of particles. The plurality of particles has a width percentage (WIP) less than 500.