Light-Transmissive Electrode Structure for LED Connection Reliability
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Solution Overview
Problem
Existing light emitting elements face challenges in establishing reliable electrical connections between light-transmissive conducting layers while minimizing light absorption, which affects emission efficiency.
Innovation Solution
A method involving a semiconductor structure with a light-transmissive conducting layer comprising a first layer and a second layer, where the second layer covers the first layer, and an insulation film with openings to expose the conducting layer, allowing for a first conducting layer to be formed in these openings for electrical connection, reducing light absorption and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-transmissive conducting layer is formed to establish electrical connection, then electrical connection reliability is improved, but light absorption increases
Solution Approach 1:
The light-transmissive conducting layer is divided into a multi-layer structure consisting of a first light-transmissive conducting layer and a second light-transmissive conducting layer. The first layer provides electrical connection functionality while the second layer with larger grain size reduces light absorption, thereby segmenting the conflicting functions into separate layers that work together.
Solution Approach 2:
Different regions of the conducting layer structure are given different properties: the first light-transmissive conducting layer is optimized for electrical conductivity and connection reliability, while the second light-transmissive conducting layer is optimized for optical transparency with larger grain size to reduce light absorption. This local differentiation resolves the contradiction between electrical function and optical function.
2Loss of energy
If the grain size of the second layer is increased to reduce light absorption, then light transmission is improved, but electrical conductivity may be affected
Solution Approach 1:
The conducting layer is segmented into two layers with different grain sizes. The first layer maintains smaller grain size for good electrical conductivity, while the second layer has larger grain size for reduced light absorption. This segmentation allows each layer to optimize its properties without compromising the other.
Solution Approach 2:
The light-transmissive conducting layer is constructed as a composite structure of two different conducting layer configurations. The combination of fine-grained first layer and coarse-grained second layer creates a composite material system that achieves both electrical conductivity and optical transparency, resolving the contradiction between these two properties.
Data Source
AI summary
A method of manufacturing a light emitting element includes: providing a semiconductor structure including: an n-side semiconductor layer, an active layer positioned on the n-side semiconductor layer, and a p-side semiconductor layer positioned on the active layer; forming a light-transmissive conducting layer including: a first layer positioned on a portion of the upper surface of the p-side semiconductor layer, and a second layer covering the upper surface of the p-side semiconductor layer and the first layer; forming an insulation film covering the second layer; removing a portion of the insulation film in a region that overlaps the first layer in a plan view to form a first opening in the insulation film and to thereby expose the light-transmissive conducting layer from the insulation film; and forming a first conducting layer in the first opening such that the first conductive layer is electrically connected to the light-transmissive conducting layer.