Optoelectronic Semiconductor Chip with Segmented Active Regions
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Solution Overview
Problem
The efficiency of optoelectronic semiconductor chips, particularly light-emitting diodes, is limited by the 'droop' effect, where efficiency drops at higher current densities, and increasing the cross-sectional area or number of active layers is impractical due to material strain and cost considerations.
Innovation Solution
The design features a multiplicity of active regions with a core-shell structure, a reflective layer, and a current spreading layer, along with an insulation material, which increases the surface area for radiation emission and directs electromagnetic radiation, reducing charge carrier density and material strain while maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cross-sectional area or number of active layers is increased to improve efficiency, then the efficiency under higher current densities improves, but material strain and manufacturing complexity increase
Solution Approach 1:
The active region is divided into multiple discrete active layers (first active layer, second active layer, third active layer) separated by intermediate layers. This segmentation allows each layer to be independently managed for strain control while collectively increasing the total active area for improved efficiency at higher current densities.
Solution Approach 2:
The patent transitions from a single-plane active region to a multi-layered three-dimensional structure. By stacking multiple active layers vertically with intermediate layers in between, the total active area is increased without proportionally increasing lateral dimensions, thereby improving efficiency while controlling material strain through the layered architecture.
2Productivity
If the cross-sectional area is increased to reduce charge carrier density, then efficiency improves, but the device size and manufacturing cost increase
Solution Approach 1:
The patent utilizes the vertical dimension by stacking multiple active layers (first, second, and third active layers) to increase the total active area. This allows the device to achieve higher efficiency through increased surface area for radiation emission while maintaining a compact lateral footprint, as the area expansion occurs primarily in the vertical direction rather than laterally.
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 enhances the semiconductor chip's efficiency under operating current conditions by enlarging the active area and reducing charge carrier density, while also reducing material strain and costs.
Implementation Method 1
the reflective layer reflects electromagnetic radiation generated during operation in the active layer
Data Source
AI summary
An optoelectronic semiconductor chip includes a multiplicity of active regions arranged at a distance from one another, and a continuous current spreading layer, wherein at least one of the active regions has a main extension direction, one of the active regions has a core region formed with a first semiconductor material, the active region has an active layer covering the core region at least in directions transversely with respect to the main extension direction of the active region, the active region has a cover layer formed with a second semiconductor material and covers the active layer at least in directions transversely with respect to the main extension direction of the active region, and the current spreading layer covers all cover layers of the active region.