CMP Polishing Pad Temperature Zoning for Wafer Planarity
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Solution Overview
Problem
The challenge in semiconductor manufacturing is achieving uniform polishing of semiconductor wafers due to varying materials and structures, leading to irregular topography and difficulties in controlling chemical mechanical polishing (CMP) operations.
Innovation Solution
Integrating a temperature control module in the CMP apparatus to manage the temperature distribution of the polishing pad, allowing for precise control of polishing rates across different zones of the wafer surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical mechanical polishing (CMP) is used to remove unwanted material from semiconductor wafer surfaces, then material removal is achieved, but uniform polishing is difficult to achieve due to various factors
Solution Approach 1:
The patent applies local quality by dividing the polishing pad into multiple zones (first zone, second zone, third zone) with different temperature control characteristics. Each zone can be independently temperature-controlled to account for local variations in polishing conditions, allowing different regions of the wafer to receive optimized polishing parameters tailored to their specific requirements.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the temperature distribution across different zones of the polishing pad during the polishing process. By modifying temperature as a key parameter in different regions, the system optimizes polishing rates and achieves uniform material removal across the entire wafer surface, resolving the contradiction between material removal and polishing uniformity.
2Adaptability or versatility
If polishing is performed on wafers with varying materials and structures, then diverse semiconductor structures can be processed, but irregular topography is produced leading to control difficulties
Solution Approach 1:
The patent addresses this contradiction by implementing local quality through zoned temperature control of the polishing pad. Different zones (first, second, and third zones) can be independently temperature-regulated to accommodate variations in material properties and structural characteristics across different regions of the wafer, enabling consistent polishing performance on diverse semiconductor structures while maintaining surface planarity.
Solution Approach 2:
The patent applies dynamics by enabling dynamic temperature adjustment across different zones of the polishing pad during the polishing process. This dynamic control allows the system to adapt to varying materials and structures in real-time, optimizing polishing conditions for each specific region and maintaining surface planarity despite the diversity of being processed.
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
This approach enhances the uniformity of the polished surface, extends the lifespan of the polishing pad, and improves the overall planarity of semiconductor wafers.
Implementation Method 1
a temperature control module (160) configured to control a temperature distribution of the polishing pad (120)
Data Source
AI summary
An apparatus and a method for forming a semiconductor structure are provided. The apparatus includes a polishing pad, a polishing head and a temperature control module. The polishing head mounts a substrate against the polishing pad. The temperature control module faces the polishing pad. The temperature control module includes a first temperature controller and a second temperature controller. The first temperature controller is configured to control a first temperature of a first zone of the polishing pad. The second temperature controller is configured to control a second temperature of a second zone of the polishing pad.