CMP Polishing Composition for Low-Defect Tungsten Planarization
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Solution Overview
Problem
Current CMP slurries are not optimized for newer chip designs, leading to increased defect counts due to the presence of components that can cause deleterious effects during the polishing process.
Innovation Solution
A polishing composition comprising at least one abrasive, a pH adjuster, a guanamine compound, and a solvent, specifically designed to reduce static etch rates on metals like tungsten while maintaining removal rates, thereby minimizing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If older CMP slurry components are used, then removal rates are maintained, but defect counts increase due to deleterious effects on newer chip designs
Solution Approach 1:
The patent removes harmful components (such as certain organic acids and specific abrasive combinations) from the CMP slurry formulation that cause defects on newer chip designs, while retaining the functional ingredients needed for material removal. This extraction of detrimental substances resolves the contradiction by eliminating the source of defects while preserving the essential polishing capability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the CMP slurry by adjusting pH levels, changing the type and concentration of chemical additives, and optimizing abrasive particle characteristics. These parameter changes enable the slurry to achieve effective material removal without causing the deleterious effects that lead to defects, thus resolving the contradiction between removal rate and defect count.
2Object-affected harmful factors
If newer chip design optimizations are implemented, then defect counts are reduced, but removal rates may decrease
Solution Approach 1:
The patent employs a composite slurry formulation that combines multiple abrasive types (such as colloidal silica with specific particle size distributions) and chemical additives in optimized proportions. This composite approach creates a synergistic effect where the combination of ingredients achieves both low defect counts and high removal rates, resolving the contradiction by leveraging the complementary properties of different materials.
Solution Approach 2:
The patent creates a dynamically adaptive slurry system where the chemical composition and physical properties can adjust during the polishing process. This may involve using pH-buffering systems or reactive components that adapt to the specific conditions encountered during polishing of different chip designs, enabling the slurry to maintain optimal performance across varying applications without sacrificing removal rate or increasing defects.
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 effectively reduces static etch rates on tungsten and molybdenum surfaces, leading to a more controlled and defect-free polishing process without significantly decreasing removal rates.
Implementation Method 1
CMP is a process used to planarize/flatten a wafer surface by removing material using abrasion-based physical processes
Implementation Method 2
CMP is a process used to planarize/flatten a wafer surface by removing material using abrasion-based physical processes concurrently with surface-based chemical reactions
Implementation Method 3
bringing a pad into contact with the surface of the substrate and moving the pad in relation to the substrate
Data Source
AI summary
The present document relates to a polishing composition that includes at least one abrasive, at least one pH adjuster, at least one guanamine compound, and water. The polishing composition can be used in a method of polishing a substrate including applying the polishing composition to a surface of a substrate and bringing a pad into contact with the surface of the substrate and moving the pad in relation to the substrate. The surface of the substrate can include tungsten and/or molybdenum.