Semiconductor Light Emitting Element Barrier Layer Design
Solution Overview
Problem
Existing semiconductor light emitting devices face challenges in preventing metal migration during production, which limits the freedom of production steps and device structures, especially when using conductive materials like silver, which are desirable for high reflectance and conductivity but prone to causing short circuits.
Innovation Solution
A method involving the formation of a semiconductor lamination with equalized potential between n-type and p-type semiconductor layers using a conductor layer, followed by the deposition of electrodes and a barrier layer to prevent migration, where the barrier layer covers the electrodes and is formed using atomic layer deposition to ensure uniformity and effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal electrodes are formed during production, then high conductivity and reflectance are achieved, but metal migration causes short circuits between n-type and p-type semiconductor layers
Solution Approach 1:
An insulating film is introduced as an intermediary layer between the metal electrodes and the semiconductor layers. This mediator prevents direct contact between metal atoms and the semiconductor, blocking the migration path while maintaining electrical conductivity through the electrode structure.
Solution Approach 2:
The insulating film is formed on the semiconductor surface before metal electrode deposition. This preliminary protective action prevents metal migration from occurring in the first place, rather than attempting to stop migration after it begins.
2Productivity
If production methods use multiple semiconductor light emitting devices formed in matrix arrangement, then productivity increases, but complexity of preventing short circuits between adjacent devices increases
Solution Approach 1:
The insulating film serves multiple functions simultaneously: it prevents metal migration within each device, acts as a barrier between adjacent devices in the matrix arrangement, and provides electrical isolation during the production process. This multi-functionality simplifies the overall production complexity.
3Illumination intensity
If silver is used in electrodes for high reflectance, then light-output efficiency improves, but susceptibility to migration and short circuit formation increases
Solution Approach 1:
The insulating film acts as a mediator that allows silver to be used in the electrode structure for high reflectance and light-output efficiency, while simultaneously preventing silver atoms from migrating to cause short circuits. The mediator enables the use of superior materials without their associated drawbacks.
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 method effectively prevents metal migration, allowing for the use of silver in electrodes while maintaining high light-output efficiency and stability, enabling more flexible production processes and device designs without compromising quality or longevity.
Implementation Method 1
the barrier layer covers the electrodes and is formed using atomic layer deposition to ensure uniformity and effectiveness
Data Source
AI summary
In a method for producing a semiconductor light emitting device: a semiconductor lamination of first and second semiconductor layers having different conductive types is formed; a portion of the semiconductor lamination is removed to expose an area of a surface of the first semiconductor layer; a conductor layer connecting the first and second semiconductor layers is formed; a first electrode is formed on the exposed areas of the first semiconductor layer and a second electrode is formed on an upper surface of the second semiconductor layer; a barrier layer covering at least one of the first and second electrodes is formed; and a connection part in the conductor layer connecting the first and second semiconductor layers is removed.