Integrated Dressing Apparatus for CMP Polishing Pad
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Solution Overview
Problem
The CMP process for semiconductor wafers results in unevenness and defects due to fine particles adsorbed on the wafer surface during the dressing of the polishing pad, affecting polishing uniformity.
Innovation Solution
A dressing apparatus with a brushing unit, cleaning liquid spray unit, and suction unit that swing together on the polishing pad, ensuring synchronized operation to effectively remove particles and maintain polishing pad consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dressing process is applied to the polishing pad to remove accumulated particles and maintain polishing performance, then polishing pad consistency is improved, but fine particles are adsorbed onto the wafer surface causing local unevenness
Solution Approach 1:
The patent combines three separate functions (brushing, cleaning liquid spraying, and particle suction) into a single integrated dressing apparatus. The brushing unit, cleaning liquid spray unit, and suction unit are coupled together and swing simultaneously on the polishing pad, allowing coordinated action to remove particles while preventing their adsorption onto wafers
Solution Approach 2:
The suction unit acts as an intermediary between the cleaning liquid spray unit and the environment. It captures particles generated during the cleaning process before they can disperse and adsorb onto wafer surfaces, thus mediating the harmful effect of particle generation
2Productivity
If cleaning liquid is sprayed to remove particles from the polishing pad, then particle removal efficiency is improved, but additional particles are generated that need to be controlled
Solution Approach 1:
The patent converts the harmful effect of particle generation into a beneficial process by using the suction unit to capture and remove the particles that are generated during cleaning. The cleaning liquid spray generates particles through mechanical action, and the suction unit immediately captures these particles, transforming a harmful byproduct into a controlled process element
Solution Approach 2:
The suction unit serves as an intermediary that captures particles between their generation (by cleaning liquid spray) and their potential harmful effect (adsorption onto wafers). This intermediary function controls the harmful factors generated during the productive cleaning process
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
Improves polishing uniformity and suppresses defects by efficiently removing particles from the polishing pad, enhancing the CMP process outcomes.
Implementation Method 1
a suction unit including a suction port for sucking particles that are generated when the cleaning liquid spray unit sprays cleaning liquid
Implementation Method 2
a cleaning liquid spray unit including a spray nozzle for spraying cleaning liquid to the polishing pad
Implementation Method 3
a brushing unit including a brush
Data Source
AI summary
An embodiment according to the present invention relates to a dressing apparatus for cleaning a polishing pad attached to a lower surface plate, the dressing apparatus comprising: a brushing part comprising a brush; a cleaning solution spray unit, comprising a spray nozzle, for spraying the polishing pad with cleaning solution; and a suction unit, comprising a suction inlet, for suctioning particles generated when the cleaning solution is sprayed by the cleaning solution spray unit, wherein the brushing unit, cleaning solution spray unit and suction unit are attached to each other and swing above the polishing pad in unison.