CMP Polishing Agent for Insulating Materials
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Solution Overview
Problem
Conventional CMP polishing agents, particularly those using cerium oxide particles, face challenges in achieving high polishing rates for insulating materials like silicon oxide while minimizing scratches and maintaining selectivity over stopper materials, especially in advanced micronization processes for semiconductor manufacturing.
Innovation Solution
The development of a polishing agent comprising water, hydroxides of tetravalent metal elements, and specific glycerin compounds that enhance the interaction between abrasive grains and insulating materials through hydrogen bonding, thereby increasing polishing rates and selectivity, and reducing scratches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cerium oxide-based CMP polishing agents are used to achieve high polishing rate for insulating materials, then polishing rate is improved, but polishing scratches increase
Solution Approach 1:
The patent changes the chemical composition parameters of the polishing agent by incorporating specific organic compounds (surfactants, chelating agents, polymers) alongside cerium oxide particles. This parameter modification allows the system to maintain high polishing rates while reducing mechanical action and scratches through optimized chemical-mechanical balance
Solution Approach 2:
The invention creates a composite polishing agent system combining cerium oxide abrasive particles with multiple organic functional compounds. This composite formulation synergistically combines high-rate polishing capability with scratch reduction mechanisms, where the organic components modulate the mechanical action of the cerium oxide particles
2Productivity
If conventional cerium oxide-based polishing agents are used, then polishing rate for insulating materials is improved, but selectivity over stopper materials deteriorates
Solution Approach 1:
The patent modifies the chemical environment parameters by adjusting pH, adding chelating agents, and incorporating specific surfactants. These parameter changes enhance the chemical affinity between the polishing agent and insulating materials while reducing interaction with stopper materials, thereby improving selectivity
Solution Approach 2:
The organic compounds in the polishing agent act as intermediaries that facilitate selective chemical interaction. Surfactants and chelating agents mediate between the cerium oxide particles and the substrate, preferentially enhancing polishing of insulating materials while protecting stopper materials through selective adsorption and chemical complexation
3Productivity
If mechanical action of abrasive particles is increased to improve polishing rate, then productivity is improved, but generation of polishing scratches worsens
Solution Approach 1:
The patent replaces purely mechanical abrasion with a chemical-mechanical polishing system. The organic compounds introduce chemical action that softens and removes material through chemical reactions, reducing reliance on mechanical force and thereby minimizing mechanical-induced scratches while maintaining high polishing rates
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 proposed solution significantly enhances the polishing rate and selectivity for insulating materials over stopper materials, allowing for high-rate polishing with reduced scratches, particularly in CMP techniques for STI, pre-metal, and interlayer insulating materials, improving the efficiency and quality of semiconductor manufacturing processes.
Implementation Method 1
specific glycerin compounds that enhance the interaction between abrasive grains and insulating materials through hydrogen bonding
Implementation Method 2
abrasive grain containing a hydroxide of a tetravalent metal element
Implementation Method 3
CMP (chemical mechanical polishing) technique
Implementation Method 4
chemical mechanical polishing
Data Source
AI summary
The polishing agent of the invention comprises water, an abrasive grain containing a hydroxide of a tetravalent metal element, and a specific glycerin compound.