Semiconductor Reflector Structure for Higher-Quality Nitride Laser Films
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Solution Overview
Problem
The existing semiconductor laser technology faces challenges with low crystal quality of the active region, leading to reduced light emission efficiency, increased risk of film cracking, and shorter service life, particularly when using Group III nitride materials on dielectric substrates.
Innovation Solution
A semiconductor structure is designed with a substrate having distinct regions for the first and second reflector structures and a light-emitting structure. The reflector structures include sub-dielectric layers with grooves where Group III nitride material is deposited, improving crystal quality and light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Group III nitride material is prepared on dielectric material (reflector), then the reflector structure is formed, but the crystal quality of the film is relatively low
Solution Approach 1:
A buffer layer is introduced as an intermediary between the dielectric reflector and the Group III nitride active region. This buffer layer serves as a transition medium that improves the crystal quality of the subsequently deposited nitride material while maintaining the reflective properties of the underlying dielectric structure.
Solution Approach 2:
The structure is segmented into distinct functional layers: a dielectric reflector layer, a buffer layer, and the Group III nitride active region. This segmentation allows each layer to be optimized independently, with the buffer layer specifically designed to enhance crystal quality without compromising the reflector's optical properties.
2Reliability
If the active region is stacked on the reflector, then the semiconductor laser structure is completed, but the light emission efficiency is reduced
Solution Approach 1:
The buffer layer acts as an intermediary that improves the interface quality between the reflector and active region, thereby enhancing light emission efficiency through better crystal quality and reduced defects at the interface.
Solution Approach 2:
The buffer layer changes the physical and chemical parameters at the interface, such as lattice matching and thermal expansion coefficients, to optimize the growth conditions for the Group III nitride material and improve overall device performance.
3Reliability
If the active region is stacked on the reflector, then the laser structure is formed, but the risk of film cracking is increased
Solution Approach 1:
The buffer layer is deposited beforehand to cushion and accommodate the thermal and mechanical stress that would otherwise cause cracking in the Group III nitride film. This preliminary layer prevents defect formation during subsequent processing and operation.
Solution Approach 2:
The buffer layer modifies the stress state and thermal properties at the interface, changing parameters such as thermal expansion mismatch and lattice constant to reduce the risk of film cracking during device fabrication and operation.
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 proposed semiconductor structure enhances light emission efficiency, reduces the risk of film cracking, and extends the service life of semiconductor lasers by improving the crystal quality of the Group III nitride material.
Implementation Method 1
The reflective surface of the first reflector structure and the reflective surface of the second reflector structure face the sidewall of the light-emitting structure
Implementation Method 2
the first sub-dielectric layer is provided with multiple first grooves uniformly distributed and a third semiconductor layer prepared in each first groove
Data Source
AI summary
Provided are a semiconductor structure and a semiconductor structure preparation method. The semiconductor structure includes a substrate, a first reflector structure, a second reflector structure, and a light-emitting structure. The substrate includes a first region, a second region, and a third region disposed between the first region and the second region. The first reflector structure is disposed in the first region of the substrate. The second reflector structure is disposed in the second region of the substrate and disposed on the same side of the substrate as the first reflector structure. The light-emitting structure is disposed in the third region of the substrate and disposed on the same side of the substrate as the first reflector structure. Each of the reflective surface of the first reflector structure and the reflective surface of the second reflector structure faces the sidewall of the light-emitting structure.