CMP Pad Groove Pattern for Slurry Distribution
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Solution Overview
Problem
Current chemical mechanical polishing (CMP) processes face inefficiencies in distributing slurry evenly across the CMP pad, leading to suboptimal semiconductor wafer planarization and increased slurry consumption.
Innovation Solution
A CMP pad design featuring a circular plate shape with concentric circular grooves and linear connection grooves that facilitate even slurry distribution, preventing excessive supply and enhancing productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional CMP pad design is used, then the structure is simple, but slurry distribution is uneven leading to suboptimal planarization
Solution Approach 1:
The CMP pad bottom surface is segmented into multiple functional zones with different groove patterns. The central region has a first pattern of grooves, while the outer region has a second pattern of grooves, allowing differentiated slurry distribution control in different areas to achieve uniform overall distribution
Solution Approach 2:
Different regions of the CMP pad are given different groove characteristics tailored to local requirements. The central region receives different slurry flow control than the outer region, optimizing planarization quality across the entire wafer surface by addressing local distribution needs
2Loss of substance
If conventional CMP pad design is used, then the structure is simple, but slurry consumption is excessive
Solution Approach 1:
The pad structure segments slurry flow paths into controlled channels defined by the groove patterns. This segmentation prevents uncontrolled slurry spread and reduces overall slurry consumption while maintaining effective lubrication and cooling
Solution Approach 2:
Slurry distribution is optimized locally in different pad regions, ensuring slurry is delivered precisely where needed for polishing action. This reduces wasteful slurry consumption in areas where it is not required for effective polishing
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 improved slurry distribution results in enhanced semiconductor productivity and reduced slurry usage, optimizing the CMP process.
Implementation Method 1
a plurality of circular grooves on a bottom surface of the pad body, the plurality of circular grooves having a circular shape; and a connection groove connecting the plurality of circular grooves
Implementation Method 2
a slurry supply configured to supply slurry to the CMP pad
Data Source
AI summary
A chemical mechanical polishing (CMP) apparatus and a CMP pad, the apparatus including a rotating plate; a CMP pad on an upper surface of the rotating plate; a rotating body facing the rotating plate and bringing a wafer into contact with the CMP pad to press the wafer; and a slurry supply configured to supply slurry to the CMP pad, wherein the CMP pad includes a pad body having a circular plate shape; a plurality of circular grooves on a bottom surface of the pad body, the plurality of circular grooves having a circular shape; and a connection groove connecting the plurality of circular grooves, the connection groove having a linear shape.