Abrasive-Free Chemical Planarization via Porous Pad
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Solution Overview
Problem
Conventional chemical mechanical planarization (CMP) processes are prone to defects, contamination, and inefficiencies due to the use of abrasive slurries and mechanical abrasion, leading to yield losses and increased costs.
Innovation Solution
A method using an abrasive-free planarization solution applied to a porous pad, where the pad selectively contacts higher substrate portions to remove material through controlled hydrolysis and complexation, reducing mechanical stress and avoiding scratches, with a dual-layer porous pad structure for efficient material removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional CMP with abrasive slurry is used, then material removal is achieved, but defects and contamination increase
Solution Approach 1:
The patent extracts and removes the abrasive component from the CMP process, using only chemical slurry without solid particles. This eliminates the source of mechanical scratches and contamination while maintaining material removal capability through pure chemical action.
Solution Approach 2:
The patent replaces the mechanical abrasion system with a chemical dissolution system. Instead of using mechanical force and abrasive particles to remove material, the process uses chemical reactions between the slurry and substrate to achieve planarization without mechanical contact damage.
2Productivity
If abrasive slurry and mechanical abrasion are used, then material removal rate is achieved, but process predictability decreases
Solution Approach 1:
By replacing mechanical abrasion with chemical dissolution, the process becomes more predictable because chemical reaction rates can be controlled through well-defined parameters such as slurry composition, temperature, and contact time, rather than relying on variable mechanical forces and abrasive particle behavior.
Solution Approach 2:
The patent controls the material removal rate by adjusting chemical parameters such as slurry pH, concentration, and temperature, which provide more precise and predictable control compared to mechanical parameters. This allows for consistent and repeatable planarization results.
3Manufacturing precision
If conventional CMP process is used, then surface planarization is achieved, but yield losses increase
Solution Approach 1:
By removing abrasives from the process, the patent eliminates the primary source of defects that lead to yield losses, while still achieving the required surface planarization through chemical means that do not create mechanical damage or contamination.
Solution Approach 2:
The patent converts the potential harm of aggressive mechanical abrasion into a beneficial gentle chemical process that achieves planarization without creating defects, thereby improving yield while maintaining surface quality.
4Object-generated harmful factors
If abrasive-free planarization solution is used, then defects are reduced, but material removal efficiency may decrease
Solution Approach 1:
The patent optimizes chemical parameters such as slurry composition, pH, temperature, and contact time to achieve high material removal rates through chemical dissolution, compensating for the absence of mechanical abrasion and maintaining productivity while reducing defects.
Solution Approach 2:
The patent uses composite slurry formulations combining multiple chemical components that work synergistically to enhance material removal efficiency through chemical reactions, achieving high productivity without abrasive particles.
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
This approach enhances process predictability, reduces defects, and improves yield by selectively removing material from higher substrate areas with less pressure and motion, eliminating the need for abrasive slurries and pad conditioners, while being scalable and customizable for advanced materials.
Implementation Method 1
removing material from the higher portions of the substrate via contact with the porous pad
Implementation Method 2
controlled hydrolysis and complexation
Implementation Method 3
contacting the substrate with the porous pad while moving the porous pad and substrate relative to one another such that higher portions of the substrate contact the porous pad
Data Source
AI summary
Examples are disclosed that relate to planarizing substrates without use of an abrasive. One example provides a method of chemically planarizing a substrate, the method comprising introducing an abrasive-free planarization solution onto a porous pad, contacting the substrate with the porous pad while moving the porous pad and substrate relative to one another such that higher portions of the substrate contact the porous pad and lower portions of the substrate do not contact the porous pad, and removing material from the higher portions of the substrate via contact with the porous pad to reduce a height of the higher portions of the substrate relative to the lower portions of the substrate.