CMP Substrate Transporter for Wet Wafer Transfer and Defect Control
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Solution Overview
Problem
During the chemical mechanical polishing (CMP) process in semiconductor manufacturing, byproducts, agglomerated abrasives, pad debris, and slurry residues on the substrate surface cause higher defect levels, reducing product yield and performance.
Innovation Solution
A substrate transporter system is used in the CMP tool to keep substrates wet during transportation and idle times, preventing the accumulation of contaminants by providing a wetting solution through wet substrate carriers and hydrophilic treatment to maintain a hydrophilic surface, thereby reducing defects and improving yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If substrates are kept wet during transportation and idle times using wet substrate carriers and wetting solutions, then defect rate is reduced by preventing contaminant accumulation, but device complexity increases due to additional wetting system components
Solution Approach 1:
The substrate is wetted with wetting solution before being transferred to the substrate carrier, and the carrier is designed to retain the substrate in a wet state during transportation and idle times. This preliminary wetting action prevents contaminant accumulation before defects can occur, addressing the reliability improvement while managing system complexity through proactive contamination prevention.
Solution Approach 2:
A wetting solution acts as an intermediary substance between the substrate and the contaminating environment. The solution forms a protective layer on the substrate surface during transportation and idle times, preventing direct contact between contaminants and the substrate, thereby reducing defect rates while adding a controllable chemical medium to the mechanical transport system.
2Manufacturing precision
If hydrophilic treatments are applied to substrate surfaces to reduce particle attraction, then manufacturing precision is improved by reducing defect formation, but process time increases due to additional treatment steps
Solution Approach 1:
The surface properties of the substrate are modified by changing their hydrophobicity/hydrophilicity parameters. By applying hydrophilic treatments, the substrate surface energy is altered to reduce the attraction of hydrophobic contaminants and particles, thereby improving manufacturing precision. This parameter change is integrated into the existing CMP workflow to minimize additional process time.
Solution Approach 2:
The wetting solution used in conjunction with hydrophilic treatments creates a composite chemical environment on the substrate surface. The combination of hydrophilic surface modification and wetting solution chemistry works synergistically to provide enhanced contamination resistance, achieving superior manufacturing precision through combined chemical effects rather than relying on a single treatment step.
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 effectively prevents contaminants from adhering to the substrate surface, enhancing yield and device performance by maintaining substrate moisture and applying hydrophilic treatments to reduce hydrophobic attraction.
Implementation Method 1
providing a wetting solution to the device surface of the substrate after the first polish of the substrate
Implementation Method 2
potentially applying hydrophilic treatments to the substrate surfaces to reduce particle attraction
Data Source
AI summary
Embodiments of the present disclosure relate a CMP tool and methods for planarization a substrate. Particularly, embodiments of the present disclosure provide a substrate transporter for use in a CMP tool. The transporter may be used transport and/or carry substrates among various polishers and cleaners in a CMP tool while preventing the substrates from drying out during transportation. By keeping surfaces of the substrates wet during substrate waiting time or idle time in the CMP tool, embodiments of the present disclosure prevent many types of defects, such as byproducts, agglomerated abrasives, pad debris, slurry residues, from accumulate on the substrate surface during CMP processing, thus improve yields and device performance.