LED Chip Electromigration Barrier via Deflected Dislocation Filling
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Solution Overview
Problem
High-power LED chips face premature failure due to aging electric leakage caused by electromigration, which restricts their long-term service life and efficiency.
Innovation Solution
Filling electromigration-resistant metals like Cu, Au, Pt, or their alloys into deflected dislocations on the semiconductor surface to block electromigration channels and prevent easy-migrating metals from causing electric leakage, while minimizing light absorption and enhancing adhesiveness and ohmic contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high-power LED chips are used to achieve high luminance and energy saving, then lighting efficiency and power consumption are improved, but aging electric leakage occurs due to electromigration which reduces service life
Solution Approach 1:
The patent introduces an electromigration barrier layer as an intermediary substance between the metal reflector and the semiconductor chip. This barrier layer mediates the interaction by blocking the electromigration pathway, preventing metal atoms from migrating along dislocation lines into the semiconductor, thus eliminating the harmful effect while maintaining the beneficial optical and electrical properties
Solution Approach 2:
The patent extracts and removes the harmful electromigration pathway by selectively blocking dislocation lines at their intersection points with metal layers. By taking out the migration channel through the electromigration barrier layer, the system eliminates the mechanism causing aging electric leakage while preserving the overall LED structure and function
2Reliability
If metal materials like Ag or Al are used in the reflector or welding layer to achieve good electrical conductivity and reflectivity, then electrical performance is improved, but electromigration occurs easily along deflected dislocation causing electric leakage
Solution Approach 1:
The patent applies local quality by making the electromigration barrier layer's properties spatially variable. The barrier layer is specifically positioned at locations where dislocation lines intersect with metal layers, providing localized protection exactly where electromigration occurs, while leaving other areas with their original properties unchanged
Solution Approach 2:
The patent employs composite materials by combining the metal reflector/welding layer with an electromigration barrier layer made of different material composition. This composite structure integrates the high conductivity and reflectivity of metals with the electromigration-blocking properties of the barrier layer material, achieving both electrical performance and reliability
3Ease of manufacture
If deflected dislocation is present in the semiconductor epitaxial laminated layer to achieve crystal growth, then material formation is enabled, but electromigration channels are formed that cause aging electric leakage
Solution Approach 1:
The patent converts the harmful effect of deflected dislocations into a beneficial one by using the same dislocation lines as pathways to deliver the electromigration barrier layer material to the critical locations. The dislocation lines, which originally cause harm by enabling metal migration, are repurposed as delivery channels for the protective barrier layer, transforming the problem into a solution
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
Significantly reduces electric leakage and improves luminous efficiency by preventing electromigration-induced failures, extending the service life and reliability of LED chips.
Implementation Method 1
block the electromigration channel formed over the semiconductor epitaxial laminated layer due to deflected dislocation to eliminate electric leakage
Implementation Method 2
increase adhesiveness of the semiconductor epitaxial laminated layer to the metal material layer
Data Source
AI summary
A light-emitting device of little aging electric leakage and high luminous efficiency and fabrication thereof, in which, the light-emitting device includes: a semiconductor epitaxial laminated layer that comprises an N-type semiconductor layer, a P-type semiconductor layer and a light-emitting layer between the N-type semiconductor layer and the P-type semiconductor layer, the surface of which has deflected dislocation; electromigration resistant metal that fills into the deflected dislocation over the N-type or/and P-type semiconductor layer surface through pretreatment to block the electromigration channel formed over the semiconductor epitaxial laminated layer due to deflected dislocation to eliminate electric leakage.