III-V Laser and Photodiode Layout for Dense SOI Photonics
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Solution Overview
Problem
Challenges exist in integrating III-V materials into silicon-on-insulator (SOI) technology to leverage the beneficial characteristics of both, particularly in silicon photonics.
Innovation Solution
A semiconductor device is designed with a silicon substrate and a silica layer, featuring laser structures and photodiodes made of layered III-V materials, where the photodiode is laterally and/or longitudinally displaced from the laser structures by a maximum distance of less than 100 micrometers, and fabricated using a two-step micro-transfer printing process to integrate III-V heterostructures onto a photonic SOI wafer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If III-V materials are integrated onto SOI wafer using conventional methods, then integration is achieved, but integration resolution is low and component density is reduced
Solution Approach 1:
The integration process is divided into two separate steps: first transferring laser structures, then transferring photodiodes. This segmentation allows each component type to be positioned with high precision independently, achieving both high integration resolution and high component density on the SOI wafer
Solution Approach 2:
Laser structures are transferred and positioned on the SOI wafer before the photodiodes are transferred. This preliminary action establishes a precise reference framework that enables subsequent high-precision positioning of photodiodes, thereby achieving high integration resolution while maintaining high component density
2Productivity
If photodiode is positioned close to laser structures (d < 100 micrometers), then integration density is improved, but alignment precision requirements increase
Solution Approach 1:
Laser structures are transferred and positioned first to establish a precise reference framework. This preliminary positioning enables subsequent photodiode transfer to achieve high alignment precision (d < 100 micrometers) while maintaining high integration density
Solution Approach 2:
A silica layer is used as an intermediary transfer medium that enables high-precision positioning of III-V materials on the SOI wafer. This intermediary layer facilitates the two-step transfer process, allowing close positioning of photodiodes to laser structures with precision d < 100 micrometers while maintaining high integration density
3Manufacturing precision
If two-step micro-transfer printing process is used, then integration resolution and component density are improved, but fabrication process complexity increases
Solution Approach 1:
The fabrication process is segmented into two independent transfer steps, each optimized for specific component types. This segmentation achieves high integration resolution and component density while managing process complexity through modular, repeatable transfer operations
Solution Approach 2:
The two-step micro-transfer printing process uses universal transfer mechanisms and intermediate silica layers that can handle different III-V material structures (laser structures and photodiodes). This universality achieves high integration resolution and component density while reducing overall process complexity through standardized procedures
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 III-V materials onto a photonic SOI wafer with high resolution, allowing for dense integration of photodiodes and laser structures, maintaining the integrity of the SOI wafer components and achieving a maximum displacement of less than 100 micrometers, thus enhancing silicon photonics performance.
Implementation Method 1
fabricated using a two-step micro-transfer printing process to integrate III-V heterostructures onto a photonic SOI wafer
Implementation Method 2
a photodiode on the silica layer, wherein the photodiode comprises layered III-V materials
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A semiconductor device (100) is provided. The semiconductor device comprises a silicon substrate (102) having a silica layer (104) thereon. One or more laser structures (106) are on the silica layer. The one or more laser structures comprise layered III-V materials. A photodiode 128 is on the silica layer. The photodiode comprises layered III-V materials. The photodiode is laterally and/or longitudinally displaced along the silica layer from a closest laser structure of the one or more laser structures by a maximum distance d, wherein d is less than 100 micrometers. A semiconductor device fabrication method is also provided.