Computer-Controlled Gas Injector System for Uniform Deposition
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Solution Overview
Problem
Existing semiconductor processing methods face challenges in achieving uniform deposition of layers due to imperfect control over gas flow rates, temperature, and pressure variations, leading to non-uniform film thickness and composition, particularly in multi-component films and graded layers.
Innovation Solution
A computer-controlled injection system that allows for real-time adjustment of injector settings during processing, enabling optimized gas flow distribution and composition control across the substrate, allowing for uniform deposition and grading of layers in a single chamber without the need for multiple processing chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple processing chambers are used to optimize injector settings for different process steps, then manufacturing precision is improved, but device complexity and loss of time increase
Solution Approach 1:
The patent applies dynamics by making the injector settings adjustable and reconfigurable during the processing sequence. Instead of fixed injector configurations for different chambers, the system dynamically changes injector parameters (flow rates, timing) within a single chamber to achieve different process optimization goals, thereby eliminating the need for multiple physical chambers.
Solution Approach 2:
The patent implements universality by designing a single processing chamber that can perform multiple process steps with different injector settings. The same chamber serves both as a deposition chamber and an etch chamber, with the injector system being reconfigured between steps, making the chamber multi-functional and eliminating the need for separate specialized chambers.
2Manufacturing precision
If injector settings are adjusted between process steps, then manufacturing precision is improved, but loss of time increases
Solution Approach 1:
The patent applies continuity of useful action by enabling injector settings to be adjusted during the processing sequence without requiring chamber shutdown. The system maintains continuous gas flow and processing conditions while dynamically modifying injector parameters, allowing seamless transitions between process steps and eliminating idle time associated with chamber purging and reconfiguration.
Solution Approach 2:
The patent implements preliminary action by pre-programming the injector adjustment sequence to be executed automatically at the optimal moment during processing. The system anticipates the need for parameter changes and executes them in advance during appropriate process phases, ensuring minimal disruption to the overall manufacturing timeline.
3Ease of operation
If manual injector tuning is performed in advance, then ease of operation is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent applies feedback by implementing a control system that monitors actual gas flow rates and process conditions, then automatically adjusts injector settings in real-time to maintain desired precision. This closed-loop control compensates for variations in gas supply, temperature, and pressure, ensuring consistent manufacturing precision without requiring complex manual tuning procedures.
Solution Approach 2:
The patent replaces manual mechanical tuning operations with an automated computer-controlled injection system. Instead of manual valve adjustment and physical tuning, the system uses electronic control mechanisms to precisely regulate gas flow, thereby eliminating operator variability and achieving higher precision while maintaining ease of operation through automated execution.
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 precise control over layer deposition, reducing non-uniformities and compositional variations, increasing yield and reducing the number of defective wafers by allowing for optimized settings for each process step and phase, and enabling the deposition of graded layers with varying composition across the film thickness.
Implementation Method 1
In semiconductor device fabrication, a substrate or wafer is subjected to a number of processes in order to deposit or remove a layer from the wafer. Many of these processes involve the injection of gases into a reaction chamber containing the wafer. These gases can include, for example, reactive gases injected to deposit a layer on the substrate.
Data Source
AI summary
A substrate processing system has computer controlled injectors. The computer is configured to adjust a plurality of injectors, such as during deposition of a graded layer, between depositions of two different layers, or between deposition and chamber clean steps.