CMP Pad Cleaning Fluid Outlet Orientation for Debris Entrainment
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Solution Overview
Problem
Conventional chemical mechanical polishing (CMP) techniques face challenges in effectively cleaning the polishing pad without contaminating or scratching substrates, as de-ionized water sprays can deposit debris and create mist, reducing cleanliness and extending pad life.
Innovation Solution
A polishing pad cleaning system employing fluid outlets oriented to direct fluid under spray bodies and towards inlet ports, entraining debris into an inner plenum for removal, thereby preventing substrate damage and improving facility cleanliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If de-ionized water spray is directed at the polishing pad to remove debris, then debris removal effectiveness is improved, but substrate contamination and scratching increase due to debris deposition and mist creation
Solution Approach 1:
The spray body is positioned above the polishing pad surface, directing fluid at an angle rather than horizontally. This vertical/diagonal dimension change allows debris to be flushed downward into a collection reservoir below the pad, preventing mist generation and substrate contamination while maintaining effective debris removal
Solution Approach 2:
A collection reservoir is introduced as an intermediary component between the polishing pad and the environment. The reservoir captures debris-laden fluid before it can contact substrates or create harmful mist, serving as a mediator that separates the cleaning function from potential harm
2Productivity
If spray velocity is increased to improve debris removal, then cleaning effectiveness is improved, but mist generation and facility cleanliness deteriorate
Solution Approach 1:
The high-velocity spray, which would normally create harmful mist, is redirected downward into a collection reservoir. The harmful kinetic energy that would generate mist is instead converted into a beneficial flushing action that drives debris into the reservoir where it can be captured rather than dispersed as mist
3Productivity
If conventional spray cleaning is used, then debris removal is achieved, but polishing pad life is reduced due to improper debris management
Solution Approach 1:
Debris is extracted from the polishing pad surface and transferred to a collection reservoir through the angled spray system. By removing debris promptly and directing it away from the pad surface, the system prevents debris-induced damage that would otherwise reduce polishing pad life
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 system efficiently removes debris from the polishing pad, reducing substrate defects, improving facility cleanliness, and extending the life of the polishing pad by directing fluid with high kinetic energy to entrain and remove debris without distributing it over the pad surface.
Implementation Method 1
fluid outlets having an orientation that directs fluid exiting the first group of fluid outlets under the bottom side of the spray body and towards the inlet port
Implementation Method 2
the debris may be entrained in the fluid and directed, or pulled, into an inner plenum of the spray body
Implementation Method 3
directing fluid with high kinetic energy to entrain and remove debris without distributing it over the pad surface
Data Source
AI summary
Polishing pad cleaning systems employing fluid outlets orientated to direct fluid under spray bodies and towards inlet ports, and related methods are disclosed. A polishing pad in combination with slurry contacts a substrate to planarize a surface of the substrate and remove substrate defects while creating debris. A spray system removes the debris from the polishing pad to prevent substrate damage and improve efficiency. By directing fluid under a spray body to the polishing pad and towards an inlet port, the debris may be entrained in the fluid and directed to an inner plenum of the spray body. The fluid-entrained debris is subsequently removed from the inner plenum through an outlet port. In this manner, the debris removal may reduce substrate defects, improve facility cleanliness, and improve pad efficiency.