Optical Semiconductor Electrode Layout for Solder-Stable Mounting
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Solution Overview
Problem
Light emitting and receiving elements face challenges in stable connection to external members via solder and in improving light emission/reception efficiency, with issues such as solder diffusion and potential short circuits.
Innovation Solution
The optical semiconductor element features a substrate with cells having distinct electrode areas, where the second electrode has a smaller area to prevent solder diffusion and a larger first electrode for efficient current distribution, along with a mesa structure and specific layer configurations to enhance stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the second electrode has a large area to improve current distribution, then light emission efficiency is improved, but solder diffusion into the electrode increases
Solution Approach 1:
The patent applies local quality by creating different electrode area configurations in different regions. The first electrode has a larger area for current distribution while the second electrode has a smaller area to prevent solder diffusion. This spatial differentiation of electrode properties resolves the contradiction between improving light emission efficiency and ensuring connection stability.
Solution Approach 2:
The patent segments the electrode structure into distinct first and second electrodes with different area characteristics. This segmentation allows each electrode to be optimized for its specific function - the first electrode for current distribution and the second electrode for solder connection stability - thereby resolving the technical contradiction.
2Productivity
If the first electrode has a large area for current distribution, then light emission efficiency is improved, but the complexity of electrode configuration increases
Solution Approach 1:
The patent employs asymmetry by designing the first and second electrodes with different area characteristics. The first electrode has a larger area optimized for current distribution while the second electrode has a smaller area. This asymmetric configuration improves light emission efficiency while maintaining manageable complexity through clear functional differentiation.
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 configuration enables stable connection to external members using solder while improving light emission/reception efficiency by reducing solder diffusion and preventing short circuits, allowing for easier identification and mounting of components.
Implementation Method 1
an optical layer that is an active layer that generates light
Implementation Method 2
an absorption layer that absorbs light
Data Source
AI summary
An optical semiconductor element includes: a substrate; and a plurality of cells formed on the substrate, the plurality of cells including a first cell, a second cell, and a third cell. A first electrode electrically connected to a first semiconductor layer of the first cell is arranged on the top surface of the first cell, and a second electrode electrically connected to a second semiconductor layer of the third cell is arranged on the top surface of the second cell. Each of the first electrode and the second electrode has a planned contact region with which solder comes into contact during electrical connection with an external member. When viewed from the thickness direction of the substrate, the area of the second electrode on the top surface of the second cell is smaller than the area of the first electrode on the top surface of the first cell.