III-V On-Silicon Integration With InP:Fe Heat Dissipation
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Solution Overview
Problem
The challenge in hetero-integration of material III-V components on a silicon-based microelectronic chip is the inefficient heat dissipation, which affects the performance of both the III-V components and the silicon-based control electronics.
Innovation Solution
An on-silicon integration method involving a semi-insulating InP:Fe-based heat dissipation structure is formed around the III-V component, with a silicon-based substrate acting as a heat dissipation layer, and an interconnection level opposite the component to manage heat dissipation and electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick BOX (Buried Oxide) layer is used for insulation, then electrical insulation is improved, but heat dissipation is worsened
Solution Approach 1:
The patent divides the substrate into multiple functional layers: the thick BOX layer provides electrical insulation, while a separate silicon-based heat dissipation layer is introduced to manage thermal flow. This segmentation allows each layer to perform its specific function without compromising the other.
Solution Approach 2:
The patent introduces an intermediary heat dissipation layer between the laser component and the substrate. This intermediary layer acts as a thermal conduit that extracts heat from the laser without interfering with the electrical insulation provided by the BOX layer.
2Productivity
If control electronics are placed close to the III-V component, then integration density is improved, but heat impact on electronics is worsened
Solution Approach 1:
The patent arranges the control electronics in a different spatial dimension relative to the heat dissipation path. The electronics are positioned laterally adjacent to the heat dissipation layer rather than directly above or below the heat source, allowing thermal and electrical functions to coexist without interference.
Solution Approach 2:
The patent creates different thermal environments in different regions of the device. The region near the laser has active heat dissipation structures, while the region with control electronics is thermally isolated, allowing each region to have the quality needed for its specific function.
3Temperature
If heat dissipation is enhanced through the substrate, then thermal management is improved, but optical power is limited
Solution Approach 1:
The patent modifies the thermal conductivity parameter of specific layers in the structure. The heat dissipation layer is designed with high thermal conductivity to efficiently conduct heat away, while other layers maintain parameters that support high optical power generation and transmission.
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 heat dissipation, maintaining the performance of silicon-based components while allowing integration of doped silicon components, such as phase modulators, by using a semi-insulating structure that conducts heat effectively and insulates electrically.
Implementation Method 1
the InP:Fe-based heat dissipation structure is, in this case, specifically chosen to provide a good electrical insulation and a good thermal conduction
Implementation Method 2
the InP:Fe-based heat dissipation structure is, in this case, specifically chosen to provide a good electrical insulation and a good thermal conduction
Implementation Method 3
Forming, by epitaxy, from said material III-V-based layer, an InP:Fe-based structure laterally bordering the component III-V
Data Source
AI summary
A method for on-silicon integration of a III-V-based material component includes providing a first substrate having a silicon-based optical layer including a waveguide, transferring a second substrate of III-V-based material on the optical layer, and forming the III-V component from the second substrate, so as to enable a coupling between the waveguide and the III-V component, by preserving a III-V-based material layer extending laterally. The method also includes forming by epitaxy from the III-V layer, an InP:Fe-based structure laterally bordering the III-V component, forming a layer including contacts configured to contact the III-V component, and transferring a third silicon-based substrate onto the layer including the contacts.