Semiconductor Laser Ridge Formation via Protrusion Removal
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Solution Overview
Problem
Existing methods for manufacturing semiconductor laser elements with ridge parts often result in voids and uneven layer thicknesses, leading to reduced heat radiation characteristics and increased crystal defects, which hinder high-temperature operating performance and yield ratios.
Innovation Solution
A method involving the lamination of layers on a semiconductor substrate, followed by forming and removing protrusions of the intermediate layer to ensure uniform widthwise lengths of the cladding and capping layers, preventing voids and uneven thicknesses, and applying an insulating layer to enhance heat radiation and reduce crystal defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wet etching is used to form the ridge part, then the manufacturing process is simple, but the ridge part width becomes non-uniform and window roof parts form causing voids
Solution Approach 1:
The etching process is divided into two distinct stages: first forming the ridge part with initial width, then selectively removing window roof parts that protrude beyond the cladding and capping layers. This segmentation allows each etching step to target specific features, achieving both simplicity and precision.
Solution Approach 2:
The method performs preliminary formation of the ridge part with extended width (including window roof parts), then subsequently removes the excess portions. This preliminary action ensures the ridge part initially covers the necessary area, and the removal step refines it to the final uniform width without compromising underlying layers.
2Strength
If window roof parts are formed on the ridge part, then the ridge structure is enhanced, but voids form between the dielectric layer and electrode preventing proper lamination
Solution Approach 1:
The window roof parts (excess protrusions) are selectively removed from the ridge part structure. This extraction eliminates the harmful protrusions that cause void formation and lamination defects, while preserving the essential ridge part structure that provides mechanical strength and optical confinement.
Solution Approach 2:
The method temporarily allows window roof parts to form during etching (which would normally cause defects), then systematically removes them in a controlled second etching step. This converts the potential harm of excess material into a beneficial process control mechanism, ensuring complete removal of defect-causing protrusions while maintaining ridge integrity.
3Productivity
If voids are formed inside the semiconductor laser element, then manufacturing is easier, but heat radiation characteristics deteriorate and crystal defects increase
Solution Approach 1:
The method ensures continuous, void-free lamination of the dielectric layer and electrode over the entire ridge part area by removing protrusions that would interrupt the lamination process. This continuous coverage eliminates voids that would otherwise form, ensuring uninterrupted heat radiation pathways and preventing crystal defects while maintaining manufacturing efficiency.
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 allows for the manufacture of semiconductor laser elements with improved heat radiation characteristics and reduced crystal defects, enhancing yield ratios and high-temperature operating performance by ensuring uniform layer thickness and void-free structures.
Implementation Method 1
a removing step of removing the protrusion of the precursor of the intermediate layer to form a compound semiconductor multilayer structure
Data Source
AI summary
A method of manufacturing a semiconductor laser element having an enhanced yield ratio is provided. The semiconductor laser element having a cladding layer, an intermediate layer, and a capping layer is manufactured as follows. At the laminating step, a plurality of lamination layers are laminated in a laminating direction. Subsequently, at protruding step, a cladding layer, a capping layer and a precursor of an intermediate layer are formed so that widthwise lengths of the cladding layer and the capping layer become shorter or uniform in the laminating direction, and so that the precursor of an intermediate layer protrudes widthwise from the cladding layer and the capping layer. At removing step, an protrusion of the precursor of the intermediate layer is removed.