Electrostatic Chuck Precoat for Stable Wafer Attraction in Etching
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Solution Overview
Problem
Existing carbon-based coatings on electrostatic chucks in semiconductor manufacturing fail to maintain an appropriate attraction force between the chuck and the substrate, leading to issues such as substrate misalignment, leakage of heat transfer gas, and abnormal dechucking due to residual attraction.
Innovation Solution
A precoat is formed on the electrostatic chuck surface using a precoat gas containing carbon and hydrogen, with controlled chamber pressure between 100 mTorr and 1,000 mTorr, and plasma generation to create a carbon-containing film with a specific crystal structure ratio of sp3, sp2, and hydrogen, ensuring an appropriate attraction force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a carbon-based coating is formed on the electrostatic chuck using conventional methods, then the coating provides some protection, but the attraction force between the chuck and substrate becomes inappropriate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chamber pressure (100-1000 mTorr) and gas composition during plasma treatment to form a carbon-containing film with specific properties. This controlled parameter approach creates a film that maintains appropriate attraction force while providing protection, resolving the contradiction between coating protection and attraction force.
Solution Approach 2:
The patent creates a composite structure by forming a carbon-containing film composed of sp3, sp2, and hydrogen components on the electrostatic chuck surface. This composite material structure provides both protective properties and maintains appropriate electrostatic attraction, simultaneously achieving coating protection and proper attraction force.
2Force
If plasma treatment is performed to form a carbon-containing film, then the attraction force is improved, but residual attraction causes abnormal dechucking
Solution Approach 1:
The patent employs periodic action by conducting plasma treatment for specific time intervals (1-60 minutes) at controlled pressure ranges. This time-controlled periodic plasma exposure creates a carbon film with optimal properties that provides good attraction force while preventing excessive residual attraction that would cause abnormal dechucking.
Solution Approach 2:
The patent uses parameter changes by adjusting chamber pressure (100-1000 mTorr) and plasma treatment duration to control the carbon film formation process. These parameter optimizations ensure the film provides appropriate attraction force without creating excessive residual attraction that would lead to dechucking instability.
3Productivity
If the chamber pressure is lowered to form a thinner film, then the processing speed increases, but the film quality deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing an optimal chamber pressure range (100-1000 mTorr) that balances film formation quality with processing efficiency. Within this pressure range, the plasma treatment forms a carbon-containing film with appropriate thickness and composition (sp3, sp2, hydrogen ratio) while maintaining reasonable processing speed, resolving the contradiction between productivity and film quality.
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 precoat maintains a stable electrostatic attraction during processing, prevents residual attraction issues, and reduces physical damage to the substrate, extending the electrostatic chuck's lifespan and preventing contamination.
Implementation Method 1
generating the plasma from the precoat gas
Implementation Method 2
forming a carbon-containing film on a surface of an electrostatic chuck disposed in a chamber
Implementation Method 3
maintains a stable electrostatic attraction during processing
Data Source
AI summary
An etching method includes (a) forming a carbon-containing film on a surface of an electrostatic chuck in a chamber, (b) disposing a substrate on the carbon-containing film, and (c) etching the substrate with plasma. (a) includes (a1) supplying a precoat gas containing carbon and hydrogen into the chamber and controlling a pressure in the chamber to be 100 mTorr or more and 1,000 mTorr or less, and (a2) generating the plasma from the precoat gas.