Selective Epitaxy Mask Edges for Current-Confining Semiconductor Lasers
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Solution Overview
Problem
Existing semiconductor devices face challenges in monolithically integrating lasers and optical amplifiers with well-confined current injection, as traditional methods lead to inefficient current distribution and unintentional growth enhancement at mask edges, which compromises reliability and manufacturability.
Innovation Solution
A semiconductor device design utilizing a mask with variable profiles to suppress or enhance growth at edges, combined with a deeply-etched ridge waveguide modulator, allowing independent control of current and optical confinement, and employing a zigzag pattern on the mask edge to prevent unwanted growth enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mask edges are used in selective area epitaxy, then manufacturing is simpler, but unintentional growth enhancement occurs at mask edges compromising reliability
Solution Approach 1:
The patent applies asymmetry by designing mask edges with specific angular orientations (e.g., 45-degree angles) rather than symmetric straight edges. This asymmetric geometry prevents unintentional growth enhancement at mask edges during selective area epitaxy, thereby improving device reliability while maintaining manufacturing feasibility through standardized photolithography processes
Solution Approach 2:
The patent implements local quality by applying different edge geometries to different mask regions. Specifically, mask edges are designed with particular angular orientations (such as 45 degrees) in critical areas where growth enhancement must be suppressed, while other regions may use different configurations. This localized approach targets reliability issues at specific locations without unnecessarily complicating the entire manufacturing process
2Use of energy by moving object
If current confinement is enhanced in monolithically integrated devices, then electrical efficiency improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the device into distinct functional regions with separate current confinement mechanisms. The modulator section and laser section are structurally separated, each with optimized current confinement geometries. This segmentation allows independent optimization of electrical efficiency in each section while managing overall device complexity through modular design
Solution Approach 2:
The patent utilizes dimensional changes by transitioning from planar current confinement to three-dimensional structures. Deeply etched ridge waveguides and buried heterostructure layers create vertical current confinement paths, enhancing electrical efficiency by restricting current flow to specific spatial dimensions while maintaining manageable device complexity through controlled geometric transformations
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 current confinement and electrical efficiency, reduces manufacturing complexity, and improves reliability by decoupling current and optical confinement, while maintaining compatibility with existing modulator processes.
Implementation Method 1
perform Selective Area Epitaxy (SAE) growth on a surface of the semiconductor wafer
Data Source
AI summary
A method includes obtaining a semiconductor wafer having an orientation in a plane; depositing one or more masks to a semiconductor wafer, wherein each mask is configured to cover a portion of the semiconductor wafer, and wherein each mask includes a perimeter having multiple sides that are substantially aligned along a preferred crystal direction relative to the orientation that provides reduced or enhanced growth enhancement at edges of the substantially aligned sides; and performing Selective Area Epitaxy (SAE) growth on a surface of the semiconductor wafer, wherein the one or more masks inhibit the SAE growth over the associated portion.