ALD Cycle Modulation for Chamber Accumulation Compensation
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Solution Overview
Problem
In atomic layer deposition (ALD) processes, achieving optimal throughput and uniformity is challenging due to the accumulation of material on chamber surfaces, which affects film properties and requires frequent chamber cleaning, leading to inefficiencies and variations in film thickness across substrates.
Innovation Solution
A method is introduced to determine the amount of accumulated deposition material in the deposition chamber and adjust the number of ALD cycles based on this accumulation, using a relationship derived from data to compensate for changes in film thickness trends, ensuring target deposition thickness is achieved across a batch of substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of ALD cycles is increased to achieve target film thickness, then film thickness is improved, but chamber material accumulation increases leading to more frequent cleaning requirements
Solution Approach 1:
The patent applies dynamics by making the number of ALD cycles variable rather than fixed. The controller dynamically adjusts the cycle count based on real-time chamber accumulation measurements, allowing the process to adapt to changing chamber conditions and maintain film thickness precision without rigid cycle numbers
Solution Approach 2:
The patent implements feedback control by measuring chamber accumulation and using this information to adjust the number of ALD cycles. The controller receives feedback about material accumulation on chamber surfaces and modifies deposition parameters accordingly, creating a closed-loop system that maintains film quality while optimizing throughput
2Manufacturing precision
If chamber cleaning is performed frequently to remove accumulated material, then film uniformity is improved, but process downtime increases
Solution Approach 1:
The patent applies preliminary action by measuring and monitoring chamber accumulation continuously during substrate processing. By detecting accumulation trends early, the system can adjust ALD cycles proactively to compensate for accumulation effects before they severely impact film uniformity, reducing the need for frequent cleaning interruptions
Solution Approach 2:
The feedback mechanism monitors chamber accumulation in real-time and uses this information to adjust processing parameters. This continuous feedback allows the system to maintain film uniformity by compensating for accumulation effects dynamically, thereby extending the time between cleaning operations
3Productivity
If the number of ALD cycles is reduced to increase throughput, then productivity is improved, but film thickness precision deteriorates
Solution Approach 1:
The patent makes the ALD cycle count dynamic rather than fixed, allowing the system to optimize throughput by reducing cycles when chamber accumulation is low while maintaining film thickness precision by increasing cycles when accumulation is high. This adaptive approach resolves the trade-off between productivity and precision
4Productivity
If chamber accumulation is allowed to increase to reduce cleaning frequency, then productivity is improved, but film thickness control becomes more difficult
Solution Approach 1:
The patent implements feedback control where chamber accumulation is continuously measured and this information feeds back to the controller, which adjusts the number of ALD cycles accordingly. This allows the system to tolerate higher accumulation levels while maintaining film thickness control through real-time parameter adjustment
Solution Approach 2:
The patent changes the parameter of ALD cycle count based on chamber accumulation levels. By varying this critical parameter in response to accumulation measurements, the system maintains film thickness control even when accumulation increases, thereby improving productivity without sacrificing 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
This approach allows for more precise control of film thickness and uniformity by dynamically adjusting the number of ALD cycles, reducing the need for frequent chamber cleaning and improving overall process efficiency and substrate uniformity.
Implementation Method 1
One method of depositing such a film is through plasma assisted atomic layer deposition (ALD)
Implementation Method 2
igniting a plasma in the reaction chamber
Data Source
AI summary
Methods and apparatuses for performing atomic layer deposition are provided. A method may include determining an amount of accumulated deposition material currently on an interior region of a deposition chamber interior, wherein the amount of accumulated deposition material changes over the course of processing a batch of substrates; applying the determined amount of accumulated deposition material to a relationship between a number of ALD cycles required to achieve a target deposition thickness, and a variable representing an amount of accumulated deposition material, wherein the applying returns a compensated number of ALD cycles for producing the target deposition thickness given the amount of accumulated deposition material currently on the interior region of the deposition chamber interior; and performing the compensated number of ALD cycles on one or more substrates in the batch.