Variable-Thickness Semiconductor Substrates for Mixed Device Integration
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Solution Overview
Problem
Existing semiconductor devices face challenges in achieving optimal integration and performance due to varying substrate requirements for different device types, necessitating improved substrate designs that accommodate diverse semiconductor layer thicknesses.
Innovation Solution
A substrate design with varying thicknesses of semiconductor layers is implemented, featuring a base, insulator layer, and semiconductor layers with distinct thicknesses and isolation structures to support different device features, achieved through epitaxial growth and patterning techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single uniform substrate is used for all semiconductor devices, then fabrication is simplified, but device performance cannot be optimized for different device types
Solution Approach 1:
The substrate is designed with spatially varying semiconductor layer thicknesses, where different regions have different thicknesses optimized for specific device types. This allows each region to have the local quality needed for its intended function while remaining part of a single integrated substrate structure.
Solution Approach 2:
The substrate is divided into multiple regions with distinct semiconductor layer thicknesses, effectively segmenting the substrate into functionally optimized zones. Each segment can support different device architectures and performance requirements simultaneously on the same substrate.
2Reliability
If semiconductor layer thickness is varied across the substrate, then device performance is optimized, but fabrication complexity increases
Solution Approach 1:
Instead of varying thickness in the horizontal plane through complex masking and etching, the invention uses vertical dimension control during epitaxial growth to create different thicknesses. This dimensional approach simplifies the fabrication process compared to planar patterning methods.
Solution Approach 2:
The semiconductor layer thickness parameter is varied across different regions of the substrate by controlling growth conditions during epitaxial formation. This parameter change is achieved through a single fabrication process rather than multiple processing steps, reducing overall complexity.
3Reliability
If thicker semiconductor layers are used, then high-current injection and electrical-thermal reliability are improved, but device integration density decreases
Solution Approach 1:
Thicker semiconductor layers are applied only in specific regions where high-current injection and electrical-thermal reliability are critical, while thinner layers are used in regions where integration density is prioritized. This localized application of different thicknesses optimizes both reliability and productivity.
Solution Approach 2:
The substrate is segmented into regions with different thickness profiles, allowing thick layers for high-reliability devices and thin layers for high-density devices to coexist on the same substrate, thereby achieving both high reliability and high integration density across the device array.
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
The substrate design enables enhanced integration and performance of semiconductor devices by supporting diverse electrical properties and facilitating planar topography, improving high-current injection, electrical-thermal reliability, and reducing noise, while allowing for greater scaling and efficient fabrication processes.
Implementation Method 1
achieved through epitaxial growth and patterning techniques
Data Source
AI summary
A substrate is provided. The substrate includes a base, a semiconductor layer over the base, and an insulator layer between the base and the semiconductor layer. The semiconductor layer has a first semiconductor layer portion having a first thickness, a second semiconductor layer portion having a second thickness, and a third semiconductor layer portion having a third thickness, and the first thickness, the second thickness, and the third thickness are different from each other.