Vertical Field-Effect Transistor Gate Structure Formation
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Solution Overview
Problem
Current manufacturing processes for vertical field-effect transistor (VFET) devices face challenges in improving performance and reliability, particularly in forming structures that enhance scalability and device stability.
Innovation Solution
The method involves forming a channel region protruding from a substrate in a vertical direction, followed by sequential layers such as a gate insulator, sacrificial layer, and top spacer, with a top source/drain and capping layer, and replacing the sacrificial layer with a gate electrode, while also performing an annealing process to cure defects and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing processes are used for VFET devices, then the basic device structure can be formed, but the scalability and reliability of the devices are insufficient
Solution Approach 1:
The method performs preliminary actions by forming the gate insulator layer, sacrificial layer, and top spacer structure before forming the gate electrode. The top spacer is formed to define a top recess that guides subsequent material deposition, ensuring precise gate electrode formation and improving device reliability through pre-established structural guidance
Solution Approach 2:
The gate structure is segmented into multiple functional layers: gate insulator layer, sacrificial layer, top spacer, and gate electrode. This segmentation allows each layer to be optimized independently for its specific function, improving overall device reliability while maintaining manufacturability through standardized processing steps
2Adaptability or versatility
If the gate structure is formed to enhance scalability, then device performance improves, but the complexity of forming the structure increases
Solution Approach 1:
The invention transitions from planar gate structures to vertical three-dimensional gate structures. The gate electrode extends vertically along the channel region, enabling better scalability as device dimensions are reduced. This vertical configuration allows the gate to control the channel more effectively in scaled devices without proportionally increasing lateral complexity
Solution Approach 2:
The top spacer acts as an intermediary element that defines the top recess and guides the formation of the gate electrode. This intermediary structure simplifies the overall manufacturing process by providing a template for precise gate electrode placement, reducing the complexity of forming scalable gate structures
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 the scalability and reliability of VFET devices by forming a stable gate structure that maintains the integrity of the gate electrode layers and reduces defects, thereby improving overall device performance.
Implementation Method 1
performing an annealing process to cure defects and improve reliability
Data Source
AI summary
Vertical field-effect transistor (VFET) devices and methods of forming VFET devices are provided. The methods may include forming a channel region that protrudes from an upper surface of a substrate in a vertical direction, forming a gate insulator layer on a side of the channel region, after forming the gate insulator layer, forming a top source/drain on the channel region, and forming a gate electrode on the gate insulator layer.