LED Protective Layer Electrode Design for Voltage Reduction
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Solution Overview
Problem
Existing light emitting devices face challenges in reducing operation voltage and improving efficiency due to limitations in current flow and potential malfunctions caused by electrode contact with active layers.
Innovation Solution
A light emitting device structure is designed with a protective layer at the sides of the active and second conductive type semiconductor layers, and a first electrode is formed on the outside of the protective layer and at least one side of the first conductive type semiconductor layer, enhancing current flow and preventing electrode contact with the active and second conductive type semiconductor layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a first electrode is formed on the outside of the protective layer to enable current flow, then efficiency is improved, but the electrode may contact the active layer causing malfunction
Solution Approach 1:
A protective layer is introduced as an intermediary between the first electrode and the active layer/second conductive type semiconductor layer. This protective layer prevents direct contact that would cause malfunction while allowing the electrode to be positioned for effective current flow into the first conductive type semiconductor layer.
Solution Approach 2:
The first electrode is positioned in a different spatial dimension - on the outside surface of the protective layer rather than directly on the semiconductor layers. This dimensional separation allows current flow functionality while preventing harmful contact with the active layer.
2Power
If the electrode is positioned to flow current smoothly, then operation voltage is reduced, but the electrode may contact the second conductive type semiconductor layer causing malfunction
Solution Approach 1:
The protective layer serves as a mediator that enables the first electrode to be positioned close to the second conductive type semiconductor layer for effective current flow, while simultaneously preventing direct contact that would cause malfunction.
3Device complexity
If no protective layer is used, then device complexity is reduced, but the electrode contacts active layers causing malfunction
Solution Approach 1:
A protective layer is introduced as a simple intermediary structure that prevents electrode contact with active layers. This single layer provides comprehensive protection against malfunction while maintaining relative structural simplicity.
Solution Approach 2:
The protective layer functions as a thin film structure that provides protection against electrode contact. This thin film approach maintains device simplicity while effectively preventing malfunction through the barrier it creates.
Data Source
AI summary
Embodiments provide a light emitting device including a light emitting structure including a first conductive type semiconductor layer, an active layer, and a second conductive type semiconductor layer, and a protective layer disposed at a side of the light emitting structure, and a first electrode formed on an outside of the protective layer.