Multi-Chamber Semiconductor Fabrication for Stable Thin-Film Transistors
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Solution Overview
Problem
Existing semiconductor device manufacturing processes face challenges in achieving high productivity, reduced manufacturing steps, shortening of process time, and maintaining consistent transistor characteristics while enabling miniaturization, high integration, low power consumption, and favorable electrical properties.
Innovation Solution
A method involving the sequential formation of insulators and oxide films using a multi-chamber apparatus to form a semiconductor device, utilizing a sputtering method for certain layers, and maintaining a low hydrogen concentration to prevent impurities and moisture exposure, ensuring cleanliness and reliability of the transistor structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of manufacturing steps is reduced to increase productivity, then productivity is improved, but manufacturing precision may deteriorate
Solution Approach 1:
Multiple chambers are merged into a single integrated apparatus, allowing sequential formation of insulator films and oxide films without removing the substrate from the apparatus. This combines multiple manufacturing steps into one continuous process, improving productivity while maintaining precision through controlled environmental transitions between chambers.
Solution Approach 2:
Insulator films and oxide films are formed in advance with specific structures and compositions before final transistor fabrication. The multi-chamber apparatus prepares the substrate with pre-configured layers, including low-hydrogen-concentration regions, that maintain their properties throughout subsequent processing steps, ensuring consistent transistor characteristics.
2Productivity
If process time is shortened to increase productivity, then productivity is improved, but reliability may deteriorate
Solution Approach 1:
The substrate remains continuously processed through multiple chambers without removal or exposure to external environments. The useful action of film formation and structure preparation continues uninterrupted, reducing total process time while maintaining reliability through constant controlled conditions and preventing contamination or property changes during transfer.
Solution Approach 2:
Each chamber maintains a controlled atmosphere appropriate for its specific process, creating inert environments that protect formed films from degradation. The atmosphere is carefully managed throughout the continuous process, ensuring that hydrogen concentration and other critical parameters remain stable, thus maintaining reliability while enabling faster processing.
3Area of stationary object
If miniaturization is achieved to enable high integration, then device density is improved, but manufacturing precision requirements increase
Solution Approach 1:
The manufacturing process is segmented into distinct chambers, each dedicated to forming specific films or structures. This segmentation allows optimization of each step for miniaturization requirements, with precise control over film thickness, composition, and uniformity. The multi-chamber design enables independent optimization of each processing stage for high-precision film formation.
Solution Approach 2:
The apparatus enables precise control and adjustment of processing parameters such as temperature, pressure, gas composition, and deposition rates in each chamber. These parameter changes are optimized for forming thin, uniform films with controlled hydrogen concentrations, enabling the precision required for miniaturized devices while maintaining manufacturability.
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 productivity, reduces transistor characteristic variations, ensures high reliability, and achieves semiconductor devices with low power consumption, high on-state current, and miniaturization, while maintaining favorable electrical properties.
Implementation Method 1
utilizing a sputtering method for certain layers
Data Source
AI summary
A method for manufacturing a semiconductor device with high productivity is provided. The method includes a step of forming a first insulator, a second insulator, and a third insulator in this order using a multi-chamber apparatus; a step of forming a fourth insulator, a fifth insulator, a first oxide film, a second oxide film, and a third oxide film in this order using a multi-chamber apparatus; a step of forming a conductive film; a step of processing the first oxide film, the second oxide film, the third oxide film, and the conductive film, thereby forming a first oxide, a second oxide, an oxide layer, and a conductive layer each having an island shape; a step of forming a sixth insulator and an insulating film in this order using a multi-chamber apparatus; a step of planarizing the insulating film; a step of forming, in the insulating film and the sixth insulator, an opening where the second oxide is exposed; a step of forming a seventh insulator and a first conductor; and a step of forming an eighth insulator and a ninth insulator in this order using a multi-chamber apparatus.