Multi-Layer Semiconductor Device Stacked Transistors
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Solution Overview
Problem
As semiconductor devices approach sub-20 nm node sizes, the challenge of increasing integration density while maintaining performance and reducing power consumption becomes increasingly difficult due to limitations in shrinking device size and packing more devices within a given footprint.
Innovation Solution
A multi-layer semiconductor device structure is developed, comprising a substrate with alternating semiconductor and insulator layers, where each layer is grown using techniques like molecular beam epitaxy or metal-organic chemical vapor deposition, allowing for the formation of multiple transistors in a stacked configuration, thereby increasing device density and flexibility in circuit design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If device size is reduced to increase integration density, then more devices can be integrated into a given area, but manufacturing precision and performance maintenance become increasingly difficult
Solution Approach 1:
The patent transitions from two-dimensional planar device arrangement to three-dimensional stacked device configuration. Multiple device layers are formed vertically above each other, allowing integration density to increase by utilizing the vertical dimension rather than continuously shrinking horizontal feature sizes. This resolves the contradiction by decoupling density improvement from feature size reduction.
Solution Approach 2:
The patent divides the semiconductor structure into multiple discrete layers, with each layer containing devices that are electrically isolated from devices in other layers. This segmentation allows each layer to be manufactured with relaxed precision requirements while achieving high overall integration density through vertical stacking.
2Quantity of substance
If more devices are packed within a given footprint, then integration density increases, but device performance and power consumption control become more difficult
Solution Approach 1:
By stacking devices vertically in multiple layers separated by insulator materials, the patent achieves high device density without compromising individual device performance. The vertical separation provides electrical isolation and thermal management pathways, maintaining reliability while increasing the number of devices within the same footprint.
Solution Approach 2:
Insulator layers are introduced as intermediary materials between adjacent device layers to provide electrical isolation and prevent interference. This allows devices in different layers to operate independently with maintained performance characteristics, resolving the contradiction between high density and performance reliability.
3Length of moving object
If device size is continuously reduced, then miniaturization is achieved, but the ability to reduce size further encounters increasing hurdles
Solution Approach 1:
The patent abandons the conventional approach of continuous device size reduction and instead utilizes vertical stacking to achieve miniaturization. This allows manufacturing processes to operate at relaxed feature sizes while still achieving compact form factors through three-dimensional integration, resolving the contradiction between device size reduction and manufacturing ease.
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 a significant increase in the number of devices per unit area, potentially doubling or tripling density with the same gate length, and allows for three-dimensional integration, enhancing design flexibility and performance.
Implementation Method 1
each layer is grown using techniques like molecular beam epitaxy or metal-organic chemical vapor deposition
Implementation Method 2
each layer is grown using techniques like molecular beam epitaxy or metal-organic chemical vapor deposition
Data Source
AI summary
A multi-layered semiconductor device and method of manufacture are provided. In an embodiment a first semiconductor layer, a first insulator layer, a second semiconductor layer, a second insulator layer, and a third semiconductor layer are formed over a substrate. A first transistor comprises the first semiconductor layer, the first insulator layer, and the second semiconductor layer, and a second transistor comprises the second semiconductor layer, the second insulator layer, and the third semiconductor layer.