Light-Emitting Element Oxide Barrier Leakage Currents
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Solution Overview
Problem
Existing light-emitting elements suffer from surface leakage currents due to manufacturing process damage, leading to reduced luminous efficiency, as they lack effective barriers to prevent electron and hole reverse flow.
Innovation Solution
Incorporating oxide layers in the barrier layers of the light-emitting element, specifically in the first and second barrier layers, to increase surface resistance and block leakage currents, thereby enhancing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional barrier layers are used without oxide layers, then the device structure is simpler and manufacturing is easier, but surface leakage currents occur due to manufacturing process damage, reducing luminous efficiency
Solution Approach 1:
The barrier layer is constructed as a composite structure combining a semiconductor layer (AlInP or AlGaAs) and an oxide layer. The semiconductor layer provides the basic barrier function while the oxide layer (formed through heat treatment) provides additional protection against surface leakage currents. This composite structure effectively blocks both electron and hole reverse flows, thereby improving luminous efficiency without excessive complexity
Solution Approach 2:
The invention changes the physical and chemical parameters of the barrier layer by introducing oxidation through heat treatment. The oxide layer is formed by controlling heat treatment conditions (temperature, atmosphere, time) on the semiconductor layer, transforming it into a composite material with enhanced electrical properties. This parameter change enables the barrier layer to resist surface leakage currents more effectively
2Reliability
If oxide layers are added to the barrier layer, then surface leakage currents are reduced and luminous efficiency improves, but the manufacturing process becomes more complex
Solution Approach 1:
The oxide layer is formed through heat treatment that is performed as a preliminary or integrated step during the manufacturing process, before final device assembly. By performing the oxidation treatment early in the process flow, the barrier layer is pre-conditioned to resist surface leakage currents, simplifying subsequent manufacturing steps and improving overall reliability
Solution Approach 2:
The invention replaces complex multi-layer semiconductor structures with a simpler semiconductor-oxide composite barrier layer. Instead of adding multiple separate protective layers, the oxide layer is formed in-situ through heat treatment, substituting a chemical process for what would otherwise require multiple mechanical deposition steps, thereby maintaining ease of manufacture while improving reliability
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 implementation of oxide layers in the barrier layers effectively reduces surface leakage currents, improving the luminous efficiency of the light-emitting elements by preventing electron and hole reverse flow and enhancing their operational performance.
Implementation Method 1
Incorporating oxide layers in the barrier layers of the light-emitting element, specifically in the first and second barrier layers, to increase surface resistance and block leakage currents
Data Source
AI summary
A light-emitting element includes a first end portion and a second end portion disposed in a length direction of the light-emitting element, a first semiconductor layer disposed at the first end portion, an active layer disposed on the first semiconductor layer, a second semiconductor layer disposed on the active layer, a first barrier layer disposed between the active layer and the first semiconductor layer and including a first region and a second region, and an insulating film that surrounds an outer circumferential surface of each of the first semiconductor layer, the active layer, the first barrier layer, and the second semiconductor layer. The first region includes a semiconductor layer having an aluminum composition higher than an aluminum composition of the first semiconductor layer, the active layer, and the second semiconductor layer. The second region includes an oxide layer.