CMP Slurry Flow Profiling for Lower Consumption and Stable Polishing
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Solution Overview
Problem
Existing methods for substrate processing in semiconductor manufacturing are inefficient in terms of slurry usage, leading to excessive consumption without maintaining optimal polishing rates.
Innovation Solution
A method involving variable slurry flow rates during different time intervals, characterized by distinct functions, is employed to optimize slurry usage and maintain polishing efficiency in chemical mechanical polishing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a constant flow rate of slurry is supplied during CMP, then the polishing process is simple to control, but slurry consumption is excessive and polishing efficiency is not optimized
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant flow rate slurry supply system to a dynamic variable flow rate system. The slurry supply flow rate is adjusted in real-time based on polishing pad wear, with the control unit increasing flow rate as the polishing pad wears to maintain consistent polishing performance, thereby reducing overall slurry consumption while adapting to changing process conditions
Solution Approach 2:
The patent implements feedback control by monitoring polishing pad wear status and using this information to adjust the slurry supply flow rate. The control unit receives feedback on the polishing pad condition and automatically modifies the slurry flow rate accordingly, creating a closed-loop system that optimizes slurry usage while maintaining polishing quality
2Productivity
If slurry flow rate is increased to maintain polishing rate, then polishing efficiency is maintained, but slurry consumption increases
Solution Approach 1:
The system dynamically adjusts slurry flow rate based on the actual polishing rate and polishing pad wear. Instead of maintaining a constantly high flow rate, the system increases flow rate only when necessary (when polishing pad wear reduces polishing efficiency), thereby maintaining productivity while minimizing slurry consumption during periods when the polishing pad is still effective
Solution Approach 2:
The patent changes the slurry flow rate parameter dynamically based on polishing pad wear conditions. The control unit modifies the flow rate parameter in response to wear detection, allowing the system to maintain optimal polishing rate with variable rather than constant high flow rate, thus reducing overall slurry consumption while preserving productivity
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 reduces slurry consumption by up to 20-40% while achieving comparable or superior polishing results to conventional methods, thereby enhancing efficiency and cost-effectiveness.
Implementation Method 1
a polishing process may be executed on the substrate. The polishing process may be fulfilled in a variety of ways. For example, a chemical mechanical polishing (CMP) process may be used to planarize the substrate
Implementation Method 2
a chemical mechanical polishing (CMP) process may be used to planarize the substrate
Data Source
AI summary
A method of processing a substrate may be provided. The method may include preparing a substrate in a substrate processing apparatus, rotating a polishing pad on the substrate, and supplying a slurry on the polishing pad, wherein the supplying of the slurry includes supplying the slurry during a first time interval at a flow rate characterized by a first function and supplying the slurry during a second time interval at a flow rate characterized by a second function, each of the first function and the second function is a function of time, and the first function is different from the second function.