CMP Slurry with Adsorbent for Patterned Oxide Polishing
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Solution Overview
Problem
Cerium oxide slurries exhibit a low initial polishing rate when used for patterned oxide layers, leading to inefficiencies in semiconductor wafer polishing due to the initial loading effect, and the use of additives to enhance this rate can increase abrasion of diamond particles, reducing the lifespan of polishing pads.
Innovation Solution
A CMP slurry composition comprising cerium oxide particles, an adsorbent such as a heteroaryl compound for improved adhesion to the polishing pad, and an adsorption adjusting agent like a non-ionic surfactant to control the adhesive force and minimize abrasion, along with a pH adjusting agent to maintain optimal pH for effective polishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cerium oxide slurries are used for polishing patterned oxide layers, then polishing selectivity is improved, but initial polishing rate deteriorates
Solution Approach 1:
The slurry is pre-loaded onto the polishing pad before the polishing process begins. This preliminary loading ensures that cerium oxide particles are already positioned on the pad surface, enabling immediate high-rate polishing of patterned oxide layers without the initial loading effect delay
Solution Approach 2:
The invention uses a composite slurry formulation containing both cerium oxide particles (for selectivity) and silica particles (for initial polishing rate). This composite approach allows the slurry to provide both high polishing selectivity for oxide layers and sufficient initial polishing rate on patterned surfaces
2Productivity
If chemical additives are added to enhance initial loading effect, then initial polishing rate is improved, but conditioner lifespan deteriorates
Solution Approach 1:
The invention extracts and eliminates the need for harmful chemical additives by using a purely physical pre-loading mechanism. Cerium oxide particles are mechanically loaded onto the polishing pad surface before polishing, achieving enhanced initial polishing rate without introducing chemicals that would accelerate diamond particle abrasion
Solution Approach 2:
The invention uses a disposable pre-loaded layer of cerium oxide particles on the polishing pad surface. This initial loading layer is consumed during the polishing process, providing high initial polishing rates without requiring long-term durability of the loading mechanism itself
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 enhances the polishing rate of patterned oxide layers while extending the lifespan of diamond disc conditioners by ensuring suitable adhesion and controlled removal of cerium oxide particles, thereby improving overall polishing efficiency and reducing surface scratches.
Implementation Method 1
an adsorbent for adsorbing the cerium oxide particles to a polishing pad
Implementation Method 2
an adsorption adjusting agent for adjusting adsorption performance of the adsorbent
Data Source
AI summary
Disclosed herein is a CMP slurry composition. The CMP slurry composition includes cerium oxide particles, an adsorbent for adsorbing the cerium oxide particles to a polishing pad, an adsorption adjusting agent for adjusting adsorption performance of the adsorbent, and a pH adjusting agent. The CMP slurry composition may improve polishing efficiency of a patterned oxide layer and lifespan of a diamond disc conditioner.