Biosurfactant Cleaning Composition for Post-CMP Wafer Defect Removal
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Solution Overview
Problem
The semiconductor industry faces challenges in effectively removing contaminants and defects from wafer surfaces post-CMP processing, which can lead to device failures and reduced performance, and existing cleaning solutions often have a significant environmental footprint.
Innovation Solution
A novel post-CMP cleaning composition incorporating a pH adjusting agent and biosurfactants, such as glycolipids and lipopeptides, which are biodegradable and produced through less energy-intensive processes, effectively removes contaminants without corroding wafer components, while offering enhanced performance and a reduced environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cleaning solutions are used to remove contaminants post-CMP, then cleaning effectiveness is achieved, but environmental footprint increases
Solution Approach 1:
The patent changes the chemical composition parameters of cleaning solutions by replacing conventional surfactants with biosurfactants (rhamnolipids, sophorolipids, surfactins) and adjusting pH levels. This substitution maintains cleaning effectiveness while improving biodegradability and reducing environmental toxicity, directly resolving the contradiction between cleaning performance and environmental impact
Solution Approach 2:
The patent creates composite cleaning formulations by combining multiple biosurfactant types (glycolipids, lipopeptides) with specific pH adjusting agents and chelating agents. These composite formulations achieve synergistic effects that maintain or enhance cleaning effectiveness while utilizing biodegradable components to reduce environmental footprint
2Reliability
If strong cleaning agents are used to remove all contaminants, then cleaning effectiveness improves, but corrosion of wafer components increases
Solution Approach 1:
The patent carefully controls pH parameters within specific ranges (pH 2-4 for acidic formulations, pH 8-10 for basic formulations) to achieve effective contaminant removal while preventing corrosion of sensitive wafer components. This precise parameter control allows the cleaning solution to be effective against organic and inorganic contaminants without attacking metal interconnects or dielectric layers
Solution Approach 2:
The patent introduces chelating agents (EDTA, DTPA, gluconic acid) as intermediaries that selectively bind to metal ions and abrasive particles. These chelating agents facilitate the removal of metal-containing contaminants and abrasive residues without causing corrosion to the wafer's metal interconnects, acting as protective mediators during the cleaning process
3Reliability
If conventional surfactants are used for cleaning, then cleaning performance is achieved, but biodegradability decreases
Solution Approach 1:
The patent fundamentally changes the chemical structure parameters of surfactants by using naturally-derived biosurfactants (rhamnolipids from Pseudomonas aeruginosa, sophorolipids from Candida bombicola, surfactins from Bacillus subtilis) instead of conventional petrochemical surfactants. These biosurfactants maintain surface-active properties for effective cleaning while being fully biodegradable, resolving the contradiction between cleaning performance and environmental persistence
Solution Approach 2:
The patent employs biodegradable biosurfactants that naturally decompose after use, replacing persistent conventional surfactants. This approach accepts the use of naturally-derived, potentially less stable compounds that provide effective cleaning performance but decompose completely in the environment, eliminating long-term pollution concerns
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 cleaning composition significantly reduces wafer defects and contaminants, improving device performance and yield while minimizing environmental harm, with the ability to be diluted for point-of-use application and compatibility with various semiconductor materials.
Implementation Method 1
at least one biosurfactant selected from the group consisting of glycolipids, lipopeptides, and mixtures thereof
Data Source
AI summary
The present disclosure relates to cleaning compositions that are used to clean semiconductor substrates. These cleaning compositions can remove the defects/contaminants arising from previous processing on the semiconductor substrates and thereby make the substrates appropriate for further processing. The cleaning compositions described herein primarily contain at least one pH adjusting agent and at least one biosurfactant.