Wafer Annealing Robot Vibration Feedback for Stable Metal Layers
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Solution Overview
Problem
In semiconductor manufacturing, the thermal annealing process for metal layers often faces challenges in achieving consistent microstructure and electrical resistivity due to variations in thermal treatment conditions.
Innovation Solution
The use of a Rapid Thermal Anneal (RTA) chamber with a delivering robot, sensor, and processing circuit to precisely control the annealing and cooling processes of wafers, ensuring consistent thermal treatment and monitoring for abnormal vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional thermal annealing process is applied to metal layers, then electrical properties are modified, but microstructure and electrical resistivity show inconsistent results due to thermal treatment variations
Solution Approach 1:
The patent applies rapid thermal annealing with specifically controlled temperature parameters (e.g., 400-600°C for copper) and time parameters (e.g., 1-30 seconds) to achieve consistent microstructure and electrical properties. The RTA process uses high heating rates (e.g., 10-100°C/second) to rapidly reach target temperatures and maintains precise temperature control during annealing, thereby resolving the inconsistency in microstructure and electrical resistivity observed in traditional thermal annealing
Solution Approach 2:
The patent incorporates in-situ monitoring systems with sensors that detect temperature, pressure, and wafer position in real-time during the RTA process. The system uses feedback control to adjust heating power and maintain temperature within tight tolerances (±5°C), ensuring repeatable annealing results. The monitoring system also detects abnormal vibrations and adjusts process parameters accordingly to maintain microstructure and electrical property consistency
2Manufacturing precision
If rapid thermal annealing is used to achieve consistent microstructure, then heating rate and temperature control must be precisely managed, but process complexity increases
Solution Approach 1:
The RTA chamber is designed as a multi-functional device that combines rapid heating, precise temperature control, in-situ monitoring, and abnormal condition detection in a single integrated system. The same chamber performs annealing for multiple metal layers (copper, cobalt, tungsten) with different material properties by adjusting process parameters, thereby reducing the need for separate equipment and simplifying the overall manufacturing system despite the sophisticated control requirements
Solution Approach 2:
The system incorporates automated feedback control that self-adjusts heating power, gas flow rates, and chamber pressure based on real-time sensor readings. The control system automatically compensates for thermal gradients and maintains temperature uniformity across the wafer surface without requiring manual intervention, thereby managing the inherent complexity of rapid thermal processing through self-regulating mechanisms
3Reliability
If in-situ monitoring is implemented to detect abnormal vibrations, then wafer damage can be prevented, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple monitoring functions (temperature sensing, pressure monitoring, vibration detection, and position tracking) into a single integrated control system within the RTA chamber. The same sensor array and control electronics that manage the thermal process also detect abnormal vibrations and other anomalies, thereby achieving comprehensive wafer protection without adding separate monitoring equipment and reducing overall system complexity
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 enables the achievement of highly consistent and predictable microstructure and electrical resistivity in metal layers, while also detecting and preventing abnormal vibrations that could damage wafers during processing.
Implementation Method 1
a heater plate and a cooler plate disposed in the chamber... rotating the fork between the cooler plate and the heater plate to anneal the metal layer
Implementation Method 2
The sensor is located on the delivering robot and configured to output a first signal in response to a motion of the delivering robot
Data Source
AI summary
A method for annealing a wafer includes loading the wafer to a fork of a delivering robot in an annealing apparatus, wherein the wafer is in contact with a vibration-detecting sensor on the fork; rotating the fork between a heating plate and a cooling plate of the annealing apparatus; outputting, by the vibration-detecting sensor, a first signal in response to a motion of the fork of the delivering robot when the wafer is loaded on the fork; and providing, by a circuitry of the annealing apparatus, a response in response to the first signal.