CMP Polishing Composition for Low Organic Particle Defects
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Solution Overview
Problem
In the semiconductor manufacturing process, chemical mechanical polishing (CMP) often results in defects due to organic particles left on the substrate surface, which are not effectively removed by conventional cleaning processes.
Innovation Solution
A polishing composition for semiconductor processes is developed, comprising polishing particles, a polishing pad protectant (such as sugar alcohol), and a fluorinated surfactant, with an Rm/e value of 2.5% or less. This composition is designed to reduce defects caused by organic particles through improved surface protection and hydrophilicity enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional polishing composition is used, then polishing rate and flatness are achieved, but organic particles remain on substrate surface causing defects
Solution Approach 1:
The patent modifies the chemical composition parameters of the polishing slurry by incorporating specific surfactants and chelating agents. These parameter changes alter the surface properties of organic particles, making them more susceptible to removal during polishing while maintaining the desired surface flatness through controlled chemical-mechanical interaction.
Solution Approach 2:
The patent introduces surfactants and chelating agents as intermediary substances that mediate between the polishing particles and organic contaminants. These intermediaries adsorb onto organic particles, enhancing their detachment from the substrate surface during polishing, thereby reducing defect formation without compromising flatness.
2Manufacturing precision
If polishing is performed to achieve fine pattern requirements, then surface flatness improves, but organic substance defects increase
Solution Approach 1:
The patent adjusts chemical composition parameters including pH, ionic strength, and surfactant concentration to optimize the polishing environment. These parameter changes enable effective organic particle removal at the fine pattern scale while preserving surface flatness through balanced chemical-mechanical polishing action.
Solution Approach 2:
The patent employs a composite polishing slurry formulation combining inorganic polishing particles with organic-functionalized additives (surfactants and chelating agents). This composite material system provides dual functionality: mechanical removal of material for flatness and chemical complexation of organic contaminants for defect reduction.
3Productivity
If conventional slurry is used for metal wiring polishing, then sufficient polishing rate is achieved, but dishing and erosion occur
Solution Approach 1:
The patent optimizes slurry composition parameters including particle size distribution, pH, and additive concentrations to control the polishing kinetics. These parameter adjustments enable high polishing rates while minimizing dishing and erosion through balanced material removal across the substrate surface.
Solution Approach 2:
The patent employs polishing particles and additives with locally optimized properties that adapt to different regions of the substrate. The slurry composition provides differential polishing action that maintains high overall polishing rate while locally controlling material removal to prevent dishing and erosion in critical areas.
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 polishing composition effectively reduces the number of defects caused by organic particles on the polished substrate surface, enhancing the production yield of semiconductor devices with fine patterns while maintaining the electrical properties of the devices.
Implementation Method 1
hydrophilicity enhancement
Implementation Method 2
chemical mechanical polishing (CMP)
Implementation Method 3
polishing pad protectant
Data Source
AI summary
A polishing composition for a semiconductor process includes polishing particles, a polishing pad protectant, and a fluorinated surfactant. The polishing composition for the semiconductor process has an Rm/e value of 2.5% or less, which is a ratio of a number of defects derived from an organic substance as calculated by Equation 1 below.Rm/e=DmDe×100(%)[Equation 1]In the Equation 1, a De value is a number of defects detected from a top surface of a substrate after polishing the top surface with the polishing composition for the semiconductor process and etching back the top surface, and a Dm value is a number of defects derived from the organic substance among 100 defects randomly selected from the defects detected from the top surface after the polishing and etching back of the top surface. In these cases, polished and etched surfaces can prevent contamination by particles, especially organic particles.