Light Emitting Device V-Pit Layer Quality Improvement
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Solution Overview
Problem
Semiconductor light-emitting devices face challenges in maintaining layer quality due to particle coagulation during the growth of active layers, which deteriorates luminescent quality.
Innovation Solution
Incorporating a layer-quality improvement layer with a group III-V semiconductor material, such as Al or In, between conductive type semiconductor layers, featuring V-pits and a superlattice structure to enhance surface roughness and layer quality, and using a V-pit generation layer to form V-pits in the active layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional active layer is grown without a layer-quality improvement layer, then the manufacturing process is simpler, but the layer quality deteriorates due to particle coagulation
Solution Approach 1:
A layer-quality improvement layer is introduced as an intermediary layer between the first conductive type semiconductor layer and the active layer. This intermediate layer prevents particle coagulation during active layer growth, thereby improving layer quality without requiring fundamental changes to the manufacturing process
Solution Approach 2:
The semiconductor structure is segmented into multiple functional layers, including the layer-quality improvement layer with V-pits, the active layer, and the superlattice layer. This segmentation allows each layer to perform its specific function independently, with the V-pit structure in the improvement layer specifically addressing particle coagulation issues
2Reliability
If the active layer is grown without V-pits, then the growth process is simpler, but particle coagulation occurs and luminescent quality deteriorates
Solution Approach 1:
V-pits are pre-formed in the layer-quality improvement layer before the active layer is grown. This preliminary action creates a controlled structure that prevents particle coagulation during subsequent active layer growth, ensuring high luminescent quality without complex growth control
Solution Approach 2:
The V-pit structure is localized specifically in the layer-quality improvement layer at the interface region, providing targeted quality improvement where particle coagulation is most problematic, while the rest of the structure maintains its conventional design
3Illumination intensity
If a layer-quality improvement layer with V-pits is added, then surface roughness is reduced and emission is improved, but the device structure becomes more complex
Solution Approach 1:
The layer-quality improvement layer uses specific material composition parameters (MxGa1-xN where M is Al or In and 0.01≦x≦0.3) and controlled V-pit dimensions to achieve reduced surface roughness and improved emission. By optimizing these parameters, high emission quality is obtained with a relatively simple additional layer
Data Source
AI summary
A light-emitting device includes a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer and having a plurality of V-pits. The light-emitting device further includes a layer-quality improvement layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer and having a plurality of V-pits with substantially same size and shape as the plurality of V-pits of the active layer, wherein layer-quality improvement layer is a group III-V semiconductor layer including Al or In. Due to the improved layer quality, the luminescent quality of the light-emitting device is improved.