Semiconductor Light Emitting Device Insulation Voids ESD Resistance
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Solution Overview
Problem
Semiconductor light emitting devices face challenges with electrostatic discharge (ESD) characteristics, dislocation density, and damage to the active layer, which affect their efficiency and reliability.
Innovation Solution
A semiconductor light emitting device is fabricated with a first conductive type semiconductor layer comprising insulation layers and voids, an active layer, and a second conductive type semiconductor layer, where the insulation layers and voids improve ESD resistance and reduce dislocation density, allowing for uniform current distribution and minimized damage to the active layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional semiconductor layer structure is used, then the device structure is simple, but the electrostatic discharge (ESD) characteristics are poor and dislocation density is high
Solution Approach 1:
The first conductive type semiconductor layer is segmented by introducing insulation layers at predetermined intervals, dividing it into multiple regions. This segmentation improves ESD characteristics by creating discrete conductive paths while managing stress distribution, resolving the contradiction between reliability improvement and structural simplicity.
Solution Approach 2:
Voids are introduced into the first conductive type semiconductor layer, creating a porous structure. This porous configuration reduces dislocation density by providing relief for lattice mismatch stress and improves ESD characteristics by creating alternative current paths, thus enhancing reliability without requiring complete structural redesign.
2Reliability
If insulation layers are added to improve ESD characteristics, then ESD resistance improves, but dislocation density increases due to structural complexity
Solution Approach 1:
The insulation layers are positioned at predetermined intervals rather than uniformly throughout the layer, creating local variations in electrical and mechanical properties. This local quality approach improves ESD resistance in specific regions while limiting the overall impact on dislocation density, balancing the two competing requirements.
Solution Approach 2:
The insulation layers are incorporated into the first conductive type semiconductor layer during the growth process before subsequent layers are deposited. This preliminary action allows the structure to be built with ESD improvement features already in place, preventing dislocation propagation from the outset rather than attempting to correct issues later.
3Reliability
If the semiconductor layer structure is modified to improve ESD characteristics, then current distribution improves, but damage to the active layer increases
Solution Approach 1:
The insulation layers act as intermediary elements between different conductive regions, mediating current flow distribution. They create controlled current paths that improve uniformity across the active layer while preventing excessive current concentration that could cause damage, thus resolving the contradiction between distribution improvement and damage prevention.
Data Source
AI summary
Provided are a semiconductor light emitting device and a method of fabricating the same. The semiconductor light emitting device includes a first conductive type semiconductor layer, an active layer, and a second conductive type semiconductor layer. The first conductive type semiconductor layer includes an insulation layer including protrusions having a predetermined interval and a void between the protrusions of the insulation layer. The active layer is disposed on the first conductive type semiconductor layer. The second conductive type semiconductor layer is disposed on the active layer.