Multi-Station ALD Chamber Parallel Cycle Control
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Solution Overview
Problem
Atomic Layer Deposition (ALD) processes face challenges in increasing wafer processing throughput due to the time-consuming nature of each deposition cycle, which limits the efficiency of semiconductor fabrication operations, especially as device sizes shrink and 3D structures become more prevalent.
Innovation Solution
The method involves a multi-station processing chamber where substrates are alternately loaded and unloaded across multiple process stations, with each station performing a specific number of deposition cycles (N and N') to achieve the target film thickness, allowing for parallel processing and optimizing film thickness accuracy without compromising throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple ALD cycles are performed in sequence to deposit film of desired thickness, then film thickness accuracy is improved, but wafer processing throughput deteriorates
Solution Approach 1:
The processing system is divided into multiple independent process stations (first set and second set of stations) that can operate simultaneously. Each station performs a specific number of deposition cycles (N or N') on different substrates, enabling parallel processing while maintaining precise thickness control through coordinated operation of segmented processing units.
Solution Approach 2:
The system dynamically adjusts the number of deposition cycles performed at different process stations based on real-time substrate positioning and processing requirements. Substrates are transferred between stations with different cycle counts (N and N') to achieve target thickness while optimizing throughput, creating a dynamic rather than static processing approach.
2Manufacturing precision
If substrates are processed one at a time through complete ALD cycles, then film deposition precision is improved, but processing time increases
Solution Approach 1:
Multiple process stations operate continuously and simultaneously, with substrates being processed in parallel rather than sequentially. While one substrate undergoes N cycles at a first station, another substrate undergoes N' cycles at a second station, eliminating idle time and maintaining continuous productive action across the system.
Solution Approach 2:
Substrates are pre-positioned at different process stations before deposition begins, with each station configured for a specific number of cycles. This preliminary arrangement allows multiple deposition sequences to commence simultaneously without waiting for sequential completion, reducing overall processing time while maintaining 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 enhances film thickness accuracy and increases processing efficiency by allowing multiple substrates to be processed in parallel, reducing the overall time required for achieving the desired film thickness while maintaining precision, thus addressing the throughput limitations of traditional ALD methods.
Implementation Method 1
a single cycle of ALD only deposits a single thin layer of material, the thickness being limited by the amount of one or more film precursor reactants which may adsorb onto the substrate surface (i.e., forming an adsorption-limited layer)
Data Source
AI summary
Disclosed are methods of depositing films of material on multiple semiconductor substrates in a multi-station processing chamber. The methods may include loading a first set of one or more substrates into the processing chamber at a first set of one or more process stations and depositing film material onto the first set of substrates by performing N cycles of film deposition. Thereafter, the methods may further include transferring the first set of substrates from the first set of process stations to a second set of one or more process stations, loading a second set of one or more substrates at the first set of process stations, and depositing film material onto the first and second sets of substrates by performing N′ cycles of film deposition, wherein N′ is not equal to N. Also disclosed are apparatuses and computer-readable media which may be used to perform similar operations.