Fabrication Tool Calibration Using Recipe-Based Chamber Offsets
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Solution Overview
Problem
Existing semiconductor fabrication tools exhibit significant variability in etching processes due to differences in hardware, calibration, and sensitivity to temperature fluctuations, leading to inconsistent results and reduced yield.
Innovation Solution
Implement a calibration process using optimized recipes to determine chamber variability and generate offset parameters, aligning fabrication tools with a standardized system to reduce variability, particularly in low-temperature etching processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fabrication tools use different hardware and calibration settings, then device versatility and adaptability are improved, but manufacturing precision and process consistency deteriorate
Solution Approach 1:
The patent applies parameter changes by systematically varying process parameters (power, pressure, gas flow rates, temperature) during calibration runs to establish sensitivity relationships. This allows the system to adapt to different tool configurations while maintaining precision by understanding how parameter changes affect outcomes.
Solution Approach 2:
The patent implements feedback through iterative calibration processes where measurement data from substrates is used to update and refine sensitivity relationships and offset parameters. This continuous feedback loop enables the system to compensate for hardware variations and maintain consistent manufacturing precision across diverse tool configurations.
2Manufacturing precision
If fabrication tools operate at low temperatures to improve etching selectivity, then etching precision is improved, but temperature control stability becomes more difficult to maintain
Solution Approach 1:
The patent applies preliminary action by performing calibration runs and establishing sensitivity relationships before actual production etching. This pre-characterization of temperature sensitivity allows the system to compensate for temperature fluctuations during low-temperature etching, maintaining both selectivity and stability.
Solution Approach 2:
The patent implements preliminary anti-action by determining offset parameters that counteract expected temperature variations and their effects on etch rate. These pre-calculated offsets compensate for temperature instability before it affects the etching process, maintaining precision despite challenging thermal conditions.
3Adaptability or versatility
If multiple process parameters are varied to optimize etching for different layer compositions, then process adaptability is improved, but process complexity increases
Solution Approach 1:
The patent applies segmentation by breaking down the complex multi-parameter optimization problem into separate sensitivity relationships for each process parameter. By analyzing parameters independently (power, pressure, gas flow, temperature) and their individual effects on etch rate, the system manages complexity while maintaining adaptability to different layer compositions.
Data Source
AI summary
A method for calibrating a fabrication system including selecting, from multiple recipes, a calibration recipe including a first process parameter for performing a fabrication process on a substrate, including: for each recipe and for two or more substrates, characterization data representative of the fabrication process performed on the two or more substrates using the recipe is received. A second process parameter is determined from the first and second states of the substrates, and a process relationship is determined between the first process parameter and the second process parameter for the recipe. The calibration recipe is selected from the multiple recipes based on the respective process relationships, a threshold variation for the process relationship is determined between the first and the second process parameter; and the calibration recipe and the threshold variation are provided for calibrating the fabrication system.