Gap Calibration via Direct Contact in Electronic Device Manufacturing
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Solution Overview
Problem
In electronic device manufacturing systems, maintaining a tightly controlled gap between process components is challenging due to increased substrate sizes, batch loads, and higher process temperatures, which affects the precision of film deposition and etching processes.
Innovation Solution
A motion control system with a programmable processor, memory, and gap calibration software that enables direct contact between process delivery apparatus and substrate support surfaces for precise gap calibration, eliminating the need for offline calibration and supplemental sensors, and accounting for thermal expansion effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If process chambers are enlarged to handle larger substrates and batch loads, then productivity is improved, but gap control precision deteriorates
Solution Approach 1:
The system employs feedback from a sensor (e.g., capacitive, inductive, or optical sensor) to detect the actual gap between the substrate support and process delivery apparatus. The motion controller receives this feedback and adjusts the actuator position in real-time to maintain the desired gap, enabling precise control even in enlarged process chambers with larger substrates and batch loads.
Solution Approach 2:
The patent replaces traditional mechanical gap measurement and adjustment systems with a sensor-based detection system and software-controlled actuator adjustment. Instead of relying solely on mechanical positioning systems, the invention uses electronic sensing and software algorithms to achieve precise gap control, eliminating the need for complex mechanical measurement devices.
2Productivity
If high process temperatures are increased to improve processing efficiency, then productivity is improved, but thermal expansion affects gap control precision
Solution Approach 1:
The system dynamically adjusts operational parameters including actuator position, heating element power, and gas flow rates in response to temperature changes. The software program monitors thermal conditions and compensates for thermal expansion by adjusting the actuator position or heating power to maintain the desired gap, enabling high-temperature processing while preserving gap control precision.
Solution Approach 2:
The system performs preliminary heating of the process chamber and components before initiating the substrate processing sequence. This allows thermal expansion to occur in a controlled manner before critical gap measurements and adjustments are made, ensuring that gap control is established under actual operating temperature conditions rather than ambient conditions.
3Manufacturing precision
If offline calibration procedures are used to calibrate gaps, then manufacturing precision is improved, but loss of time increases
Solution Approach 1:
The system performs self-calibration by using the substrate support or substrate itself as the reference standard. The motion controller executes a calibration sequence where the actuator moves the process delivery apparatus until direct contact is detected with the substrate support or substrate, automatically establishing the zero-gap reference position without requiring external calibration equipment or manual intervention.
Solution Approach 2:
The calibration procedure is integrated into the startup sequence of the process chamber, performed automatically before normal production begins. The motion controller executes the calibration routine as part of the initial system preparation, so that by the time production starts, gap calibration is already complete, eliminating dedicated calibration time from the production schedule.
4Manufacturing precision
If supplemental sensors and calibration equipment are added to improve gap control, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The system uses existing components (substrate support, substrate, actuator, and standard sensors already present in the process chamber) for multiple purposes. The substrate support serves both as a mechanical support structure and as a reference standard for gap calibration. The actuator serves both as a positioning device and as a means for executing calibration movements. This multi-functionality eliminates the need for dedicated calibration equipment while maintaining measurement accuracy.
Solution Approach 2:
The software program acts as an intermediary that coordinates between the sensor, actuator, and motion controller to achieve gap control. Rather than adding complex hardware interfaces, the software mediates the interaction between existing components, processing sensor data and translating it into actuator commands, thereby simplifying the overall system architecture while enabling precise gap control.
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 solution allows for accurate and continuous gap control within process chambers and loadlocks, improving film deposition and etching uniformity and reducing mechanical complexity, while maintaining vacuum integrity and high process temperatures.
Implementation Method 1
a feedback device coupled to the actuator and to the motion controller... configured to cause direct contact between respective surfaces of the process delivery apparatus and the substrate support or a substrate received on the substrate support
Implementation Method 2
as the size of process chambers increases to handle larger substrate sizes, larger batch loads of substrates, and higher process temperatures (which may affect the thermal expansion of process components), the desired gap may become more difficult to control
Data Source
AI summary
An electronic device manufacturing system includes a motion control system for calibrating a gap between surfaces of process chamber or loadlock components by moving those component surfaces into direct contact with each other. The component surfaces may include a surface of a substrate and/or a substrate support and a surface of process delivery apparatus, which may be, e.g., a pattern mask and/or a plasma or gas distribution assembly. The motion control system may include a motion controller, a software program executable by the motion controller, a network, one or more actuator drivers, a software program executable by the one or more actuator drivers, one or more actuators, and one or more feedback devices. Methods of calibrating a gap via direct contact of process chamber or loadlock component surfaces are also provided, as are other aspects.