CMP Pad Temperature Control via Heating and Steam Suction
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Solution Overview
Problem
The existing chemical mechanical polishing (CMP) processes face inefficiencies due to heat loss when steam injection modules are used, leading to reduced polishing efficiency and particle generation from condensation of water vapor.
Innovation Solution
A CMP apparatus with a temperature control unit featuring heating members and suction ports to heat the CMP pad and prevent water vapor condensation, ensuring efficient thermal management and particle-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If steam injection module is used to increase temperature of polishing pad, then temperature control is improved, but heat loss occurs and polishing efficiency is reduced
Solution Approach 1:
The heating members are positioned to heat the CMP pad in advance before the slurry reaches the polishing area. The temperature control unit is located between the slurry supply unit and the polishing head, pre-heating the pad surface to prevent subsequent heat loss during the polishing process.
Solution Approach 2:
The temperature control unit acts as an intermediary component between the slurry supply system and the polishing head. It includes a body with suction ports that manage steam and water vapor, preventing direct contact between cold steam and the polishing interface, thereby reducing heat loss and condensation issues.
2Temperature
If steam injection module is used to heat polishing pad, then temperature is improved, but particle generation from condensation occurs
Solution Approach 1:
The temperature control unit with suction ports serves as an intermediary that captures and removes steam and water vapor before they can condense on the polishing pad or wafer. This prevents particle generation from condensation while maintaining the necessary temperature for effective polishing.
Solution Approach 2:
The suction ports extract steam and water vapor from the polishing area. By removing the harmful vapor phase before condensation occurs, the system prevents particle contamination while maintaining optimal polishing temperature through controlled heating.
3Temperature
If heating members are added to control temperature, then temperature control is improved, but device complexity increases
Solution Approach 1:
The temperature control unit combines multiple functions into a single integrated component: heating members for temperature control, suction ports for steam removal, and a body structure that positions both elements optimally. This merged design achieves effective temperature control without proportionally increasing overall system complexity.
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 solution enhances thermal efficiency by heating the CMP pad and slurry simultaneously, preventing particle generation from water vapor condensation, thereby improving the CMP process's effectiveness and reducing heat loss.
Implementation Method 1
heating members disposed on a bottom surface of the body to heat the CMP pad
Implementation Method 2
the body may be provided with a suction port disposed between the heating members to suction steam
Data Source
AI summary
A chemical mechanical polishing apparatus, may include: a turntable; a CMP pad installed on an upper surface of the turntable; a polishing head disposed above the turntable and contacting a wafer with the CMP pad to press the wafer; a slurry supply unit supplying slurry to the CMP pad; and a temperature control unit disposed between the slurry supply unit and the polishing head, wherein the temperature control unit may be provided with a body disposed above the CMP pad; and heating members disposed on a bottom surface of the body to heat the CMP pad, wherein the body may be provided with a suction port disposed between the heating members to suction steam.