AlGaAs Semiconductor Light-Emitting Device Carbon Oxygen Control
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Solution Overview
Problem
In semiconductor light-emitting devices using AlGaAs mixed crystals, the incorporation of oxygen and carbon impurities poses a challenge in achieving optimal light emission characteristics and crystal quality while balancing productivity and manufacturing costs, as conventional growth conditions that reduce these impurities are not universally suitable for all semiconductor layers.
Innovation Solution
The semiconductor light-emitting device incorporates n-type and p-type cladding layers with high concentrations of carbon, which occupy Group V vacancies and compensate for oxygen, thereby improving crystal quality and light emission characteristics, while maintaining a balanced carbon and oxygen concentration to suppress deep-level donors and enhance conductivity control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If growth conditions are optimized to reduce oxygen and carbon incorporation in AlGaAs, then light emission characteristics improve, but crystal quality of other semiconductor layers deteriorates
Solution Approach 1:
The patent applies local quality by implementing layer-specific growth condition optimization. Different semiconductor layers (AlGaAs, InGaAs, GaAs) are grown under tailored conditions appropriate to their compositional requirements. For instance, AlGaAs layers use conditions optimized for low oxygen/carbon incorporation, while InGaAs layers use conditions optimized for their specific crystal quality needs, thereby resolving the contradiction between improving light emission in AlGaAs and maintaining overall crystal quality.
Solution Approach 2:
The patent employs parameter changes by systematically adjusting growth parameters (temperature, pressure, gas flow rates, V/III ratios) for each semiconductor layer based on its compositional characteristics. This allows each layer to be grown under optimal conditions specific to its material properties, preventing the degradation of crystal quality in non-AlGaAs layers while achieving low impurity incorporation in AlGaAs light-emitting regions.
2Manufacturing precision
If growth conditions are optimized for each semiconductor layer, then crystal quality improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent segments the manufacturing process into distinct growth stages, each dedicated to specific semiconductor layers with similar compositional requirements. By dividing the multi-layer structure growth into manageable segments with standardized condition sets, the patent reduces overall process complexity while maintaining optimal crystal quality for each layer type.
Solution Approach 2:
The patent establishes universal growth condition protocols that can be applied across multiple layers with similar material compositions. Once optimized for a particular layer type (e.g., AlGaAs cladding layers), these standardized condition sets can be reused for subsequent identical layers, reducing the need for continuous parameter optimization and simplifying the manufacturing process.
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 approach improves the crystal quality and light emission characteristics of the AlGaAs mixed crystal layers, ensuring a balance between device performance and manufacturing efficiency by optimizing the growth conditions for carbon and oxygen incorporation.
Implementation Method 1
the semiconductor light-emitting device includes n-type and p-type cladding layers in which a carbon concentration is relatively high; and the Group V vacancies are occupied so that an oxygen concentration is suppressed
Data Source
AI summary
A semiconductor light-emitting device includes first and second semiconductor layers and a light-emitting layer provided between the first semiconductor layer and the second semiconductor layer. The first semiconductor layer includes a compound semiconductor represented by a compositional formula AlXGa1-XAs (0<X<1). The first semiconductor layer has an n-type conductivity and includes a first impurity of the n-type. The first layer further includes carbon with a lower concentration than a concentration of the first impurity, and oxygen with a lower concentration than the concentration of the first impurity. The second semiconductor layer includes a compound semiconductor represented by a compositional formula AlYGa1-YAs (0<Y<1). The second semiconductor layer has a p-type conductivity and including a second impurity of the p-type. The second semiconductor layer further includes carbon with a concentration substantially equal to the carbon concentration in the first semiconductor layer.