3D IC Device Layer Transfer for Wire Performance
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Solution Overview
Problem
The performance and functionality of Integrated Circuits (ICs) are hindered by degrading wire performance due to 'scaling', which is not effectively addressed by existing 3D stacking technologies, leading to increased power consumption and limited integration of transistors and memory cells.
Innovation Solution
The development of multilayer Three Dimensional Integrated Circuit (3D IC) devices utilizing layer transfer techniques, including epitaxial layer transfer and selective etching of SiGe vs. silicon, to create a 3D structure with reused donor wafers, allowing for heterogeneous integration of MEMS sensors, image sensors, and various memory types, while maintaining thermal isolation and reducing substrate effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional 2D IC layout is used, then manufacturing process is simple, but wire performance degrades and power consumption increases
Solution Approach 1:
The patent transitions from conventional 2D IC layout to 3D stacked architecture, where multiple layers of transistors and interconnects are vertically stacked. This dimensional change reduces wire lengths by allowing direct vertical connections between components on different layers, thereby improving wire performance and reducing power consumption while accepting increased structural complexity
2Productivity
If 3D stacking is implemented, then wire lengths are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the IC into multiple discrete layers that can be independently fabricated and then stacked. Each layer contains specific functional blocks (transistors, interconnects, memory cells) that are separated into distinct structural units, allowing parallel fabrication processes and reducing the complexity of fabricating the entire structure in one continuous process
3Adaptability or versatility
If multiple layers are integrated, then functionality is enhanced, but thermal management becomes difficult
Solution Approach 1:
The patent implements localized thermal management strategies where different regions of the 3D IC are designed with specific thermal characteristics. Heat-generating components like logic circuits are positioned adjacent to high-thermal-conductivity interconnect layers that act as heat sinks, while memory layers are positioned to minimize thermal interference. This spatial arrangement of components with different thermal requirements allows high-density integration while managing thermal budgets through local optimization
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 efficient integration of multiple layers with reduced thermal budgets, mixed technology nodes, and crystal structures, improving performance, yield, and flexibility in IC design, while minimizing power consumption and enhancing data transfer efficiency.
Implementation Method 1
epitaxial layer transfer
Implementation Method 2
selective etching of SiGe vs. silicon
Data Source
AI summary
A 3D semiconductor device, the device including: a first level; a second level; and a third level, where the first level includes single crystal silicon and a plurality of logic circuits, where the plurality of logic circuits includes a first logic circuit and a second logic circuit, where the second level is disposed directly above the first level and includes a first plurality of arrays of memory cells, where the third level is disposed directly above the second level and includes a plurality of on-chip RF circuits, and where a portion of interconnections between the first logic circuit and the second logic circuit includes the plurality of on-chip RF circuits.