Micro LED Barrier Layer Structure Against Solder Eutectic
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Solution Overview
Problem
The existing solder bump process in micro light emitting diode (LED) display devices leads to the formation of a metal eutectic between the solder bump and the electrode layer due to high temperatures, affecting electrical properties and structural reliability.
Innovation Solution
A barrier layer is disposed on the electrode layer to prevent eutectic formation, with the bonding layer positioned on the barrier layer, ensuring better adhesion and electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bonding layer is directly disposed on the electrode layer, then the bonding process can be simplified, but metal eutectic forms between the solder bump and electrode layer due to high temperature, affecting electrical properties and structural reliability
Solution Approach 1:
A barrier layer is introduced as an intermediary between the electrode layer and bonding layer. This barrier layer prevents direct contact between the solder bump and electrode layer, thereby preventing metal eutectic formation during high-temperature bonding while maintaining structural integrity and electrical properties.
Solution Approach 2:
The interface between the electrode layer and bonding layer is segmented by inserting a barrier layer. This segmentation separates the functional requirements of electrical conduction (electrode layer) and bonding (bonding layer), preventing harmful interactions while allowing each layer to perform its designated function.
2Reliability
If the barrier layer is disposed on the electrode layer, then eutectic formation is prevented and adhesion is improved, but the device structure becomes more complex
Solution Approach 1:
The barrier layer serves as a thin intermediary film that adds minimal structural complexity while providing critical functions of preventing eutectic formation and improving adhesion. The thin-film nature minimizes the increase in overall device complexity.
3Ease of manufacture
If the bonding layer is positioned directly on the electrode layer, then the manufacturing process can be simplified, but adhesion between layers is insufficient
Solution Approach 1:
The barrier layer acts as an adhesion promoter and intermediary surface that enhances bonding between the electrode layer and bonding layer. It provides a chemically active surface that improves interfacial adhesion strength while maintaining manufacturing feasibility.
Solution Approach 2:
The multi-layer structure (electrode layer + barrier layer + bonding layer) creates a composite material system where each layer contributes specific properties. The barrier layer material is selected to provide both adhesion enhancement and eutectic prevention, optimizing the composite structure for both manufacturing and performance.
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
The micro LED structure achieves improved electrical properties and structural reliability, enhancing the display yield of the micro LED display device.
Implementation Method 1
The barrier layer is disposed on the electrode layer... prevent the eutectic problem between the electrode layer and the bonding layer
Data Source
AI summary
A micro light emitting diode structure including an epitaxial structure, an electrode layer, a barrier layer and a bonding layer is provided. The epitaxial structure has a surface. The electrode layer is disposed on the surface of the epitaxial structure. The barrier layer is disposed on the electrode layer. The bonding layer is disposed on the barrier layer and away from the electrode layer.