GaN Cladding Layer for Semiconductor Laser Heat Dissipation
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Solution Overview
Problem
Semiconductor laser devices formed on silicon-on-insulator (SOI) substrates face heat dissipation issues due to the silicon oxide layer, leading to device deterioration.
Innovation Solution
A semiconductor laser device is designed with a gallium nitride (GaN) cladding layer that enhances heat conductivity, along with a light waveguide structure and electrode configuration, including separate confinement heterostructure (SCH) patterns, to effectively manage heat and improve device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a silicon oxide layer is used as substrate for semiconductor laser device, then manufacturing ease is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The patent employs a composite substrate structure combining silicon oxide layer with gallium nitride cladding layers. The silicon oxide provides manufacturing advantages while the GaN cladding layers provide superior thermal conductivity, creating a composite material system that simultaneously achieves ease of manufacture and effective heat dissipation.
Solution Approach 2:
The invention introduces gallium nitride cladding layers with high thermal conductivity at specific locations (adjacent to the laser diode structure) where heat generation occurs. This local enhancement of thermal properties addresses the heat dissipation problem without compromising the overall manufacturing ease of the silicon oxide substrate.
2Temperature
If gallium nitride cladding layer is added to improve heat dissipation, then heat dissipation capability is improved, but device complexity increases
Solution Approach 1:
The gallium nitride cladding layers serve multiple functions simultaneously: they provide high thermal conductivity for heat dissipation, act as optical confinement structures for the laser mode, and function as structural support layers. This multi-functionality reduces the need for additional separate heat dissipation components, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the heat dissipation function with the existing optical waveguide and confinement structure by using gallium nitride material for the cladding layers. This consolidation integrates thermal management into the optical structure rather than adding separate thermal management components, thus improving heat dissipation while controlling device complexity.
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 solution effectively discharges heat generated by the semiconductor laser source, enhancing the device's characteristics and preventing deterioration, compared to conventional devices on SOI substrates.
Implementation Method 1
a first cladding on a substrate, the first cladding including gallium nitride (GaN)... effectively discharges heat generated by the semiconductor laser source
Data Source
AI summary
A semiconductor laser device includes a first cladding including gallium nitride (GaN) on a substrate, a light waveguide on the first cladding, a first contact pattern, a first SCH pattern, a first active pattern, a second SCH pattern, a second cladding and a second contact pattern sequentially stacked on the light waveguide, and first and second electrodes on the first and second contact patterns, respectively.