Oxidation-Resistant Chamber Coating for Plasma Flaking Control
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Solution Overview
Problem
Chamber film accumulation leads to adhesion loss, flaking, and particle defects due to oxygen-rich plasma, compromising wafer processing quality and reducing batch size.
Innovation Solution
Implementing a high-carbon-content, oxidation-resistant protective layer on chamber surfaces through chemical vapor deposition, compensating for film stress and mitigating plasma attack, with periodic deposition of paired SiCO and protective layers to maintain defect performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cleaning and preconditioning methods are used, then chamber maintenance is simple, but film adhesion deteriorates and flaking occurs due to oxygen-rich plasma
Solution Approach 1:
A preconditioning film is deposited on the chamber wall before the wafer processing step to prevent film adhesion deterioration. This preliminary protective layer is applied in advance to counteract the harmful effects of oxygen-rich plasma that will occur during subsequent processing, thereby maintaining film adhesion without requiring complex real-time interventions.
Solution Approach 2:
The chamber conditioning process employs a composite structure consisting of a preconditioning film layer and a protective layer. This multi-layer composite approach combines different material properties to simultaneously address adhesion requirements and resistance to plasma-induced flaking, achieving reliable film performance without overly complicating the overall chamber maintenance procedure.
2Productivity
If oxygen-rich plasma is used for processing, then processing efficiency is maintained, but film flaking increases due to plasma-induced stress and carbon consumption
Solution Approach 1:
The preconditioning film serves as a cushioning layer deposited beforehand to absorb and mitigate the harmful effects of oxygen-rich plasma on the accumulated film. This protective layer prevents direct plasma exposure to the film interface, reducing plasma-induced stress and carbon consumption that would otherwise cause flaking, while allowing the oxygen-rich plasma processing to continue at full efficiency.
3Productivity
If film accumulation is allowed to increase batch size, then productivity improves, but adhesion deteriorates and defects increase
Solution Approach 1:
The chamber conditioning process is implemented periodically between wafer batches to maintain optimal chamber conditions. By applying preconditioning films and protective layers at regular intervals, the system can sustain higher film accumulation levels that enable larger batch sizes while periodically removing accumulated film to prevent adhesion deterioration and defect formation, thus balancing productivity and manufacturing precision.
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
Significantly improves wafer defect performance and extends batch size by 250%, maintaining chamber quality and minimizing film damage.
Implementation Method 1
depositing a protective layer onto the SiCO film
Implementation Method 2
striking a plasma within the chamber
Data Source
AI summary
In some examples, a method for conditioning a wafer processing chamber comprises setting a pressure in the chamber to a predetermined pressure range, setting a temperature of the chamber to a predetermined temperature, and supplying a process gas mixture to a gas distribution device within the chamber. A plasma is struck within the chamber and a condition in the chamber is monitored. Based on a detection of the monitored condition meeting or transgressing a threshold value, a chamber conditioning operation is implemented. The chamber conditioning operation may include depositing a preconditioning film onto an internal surface of the chamber, depositing a silicon oxycarbide (SiCO) film onto the preconditioning film, and depositing a protective layer onto the SiCO film.