CMP System Cleaning via Sequential Fluid Application
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Solution Overview
Problem
The existing chemical mechanical polishing (CMP) systems face challenges in efficiently removing dried residues of polishing fluids, which leads to undesirable damage to substrate surfaces due to agglomerated abrasive particles, requiring laborious and time-consuming manual cleaning processes.
Innovation Solution
A method and system for sequential application of cleaning fluids using a distribution manifold and spray nozzles, where two different cleaning fluids are used to effectively clean surfaces of the CMP system, with a system controller regulating the flow and application of these fluids to improve maintenance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual cleaning procedures are used to remove accumulated residue, then cleaning effectiveness is improved, but system downtime and maintenance time increase
Solution Approach 1:
The polishing system performs its own cleaning operation automatically during substrate transfer time. The cleaning apparatus is integrated into the polishing system and executes cleaning procedures without external intervention, allowing the system to maintain itself during otherwise idle time periods.
Solution Approach 2:
The system performs cleaning operations in advance before the next polishing operation begins. By utilizing the time between substrate transfers to clean components, the system prepares cleaned surfaces ready for subsequent operations, eliminating the need for separate maintenance downtime.
2Object-affected harmful factors
If frequent manual cleaning is performed, then residue accumulation is prevented, but productivity and output decrease
Solution Approach 1:
The cleaning operation continues uninterrupted during substrate transfer time, which would otherwise be idle time. The cleaning apparatus operates continuously on polishing pad surfaces and other components during the natural cycle between polishing operations, maintaining cleanliness without interrupting production flow.
Solution Approach 2:
The system dynamically adjusts operation sequences to perform cleaning during substrate transfer intervals. The control system coordinates substrate transfer and cleaning operations to occur simultaneously, optimizing the use of available time and maintaining productivity while preventing residue accumulation.
3Loss of time
If automated cleaning systems are implemented, then maintenance time is reduced, but device complexity increases
Solution Approach 1:
The cleaning apparatus serves multiple functions: it cleans polishing pad surfaces, cleans other system components, and can be integrated into existing substrate transfer mechanisms. By making the cleaning system multi-functional and integrating it with existing infrastructure, the added complexity is minimized while achieving comprehensive cleaning coverage.
Solution Approach 2:
The cleaning system is merged with the existing substrate carrier and transfer mechanisms. The cleaning apparatus utilizes the substrate carrier structure and transfer timing, combining cleaning functionality with existing operational cycles rather than adding completely separate automated cleaning equipment.
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 polishing system downtime by automating the cleaning process, ensuring thorough removal of residues and preparing surfaces for subsequent operations, thereby enhancing the reliability and efficiency of CMP systems.
Implementation Method 1
dispensing a first cleaning fluid from a first one or more nozzles of a plurality of nozzles to direct the first cleaning fluid onto the first surface of the plurality of surfaces and dispensing a second cleaning fluid from the first one or more nozzles of the plurality of nozzles to direct the second cleaning fluid onto the first surface
Implementation Method 2
removing the accumulated residue from component surfaces is generally laborious and time-consuming as the agglomerated abrasive particles often form cement-like layers
Data Source
AI summary
An apparatus and method for sequential application of cleaning fluids for improved maintenance of chemical mechanical polishing (CMP) systems is disclosed. A method includes transferring a first substrate to a first polishing station of a plurality of polishing stations, polishing the first substrate at the first polishing station, transferring the first substrate to a second polishing station, and transferring a second substrate to the first polishing station. The method includes cleaning a first surface of a plurality of surfaces of the polishing system by dispensing a first cleaning fluid from a first one or more nozzles of a plurality of nozzles to direct the first cleaning fluid onto the first surface and dispensing a second cleaning fluid from the first one or more nozzles to direct the second cleaning fluid onto the first surface, where the second cleaning fluid is different from the first cleaning fluid.