Nanostructure Semiconductor Light Emitting Device Rod Capping Layers
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Solution Overview
Problem
Current semiconductor light-emitting devices face challenges in achieving high light emission efficiency, particularly in higher-current/higher-power applications, where improving crystallinity and light-emitting areas is necessary to enhance performance.
Innovation Solution
A semiconductor light-emitting device is designed with a base layer and a plurality of light-emitting nanostructures that include rod layers and capping layers of varying heights, arranged to optimize light emission efficiency, where the capping layers are grown to a uniform height regardless of the rod layer heights, and the nanostructures are formed with specific geometries and materials to control light emission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rod layers of different heights are used in light-emitting nanostructures, then light-emitting area and crystallinity are improved, but uniformity of nanostructure heights deteriorates
Solution Approach 1:
The light-emitting nanostructure is segmented into two distinct parts: a rod layer with varying heights that provides the light-emitting area and crystallinity, and a capping layer with uniform height that ensures manufacturing precision. This segmentation allows each part to fulfill its specific function without compromising the other, resolving the contradiction between light-emission efficiency and uniformity.
2Manufacturing precision
If capping layers are grown to uniform height regardless of rod layer heights, then nanostructure uniformity is improved, but complexity of the manufacturing process increases
Solution Approach 1:
The rod layers are prepared in advance with varying heights to optimize light-emitting properties before the capping layers are grown. This preliminary action allows the subsequent capping layer formation to focus solely on achieving uniform height, simplifying the overall process control while maintaining manufacturing precision.
3Power
If light-emitting nanostructures are designed for higher-current/higher-power applications, then power output is improved, but heat generation and device reliability worsen
Solution Approach 1:
The capping layers are designed with uniform height and optimized material composition specifically at the regions where heat generation is most critical, providing localized thermal management. This local quality enhancement allows the device to operate at higher power levels while maintaining reliability by addressing heat dissipation at the most critical locations.
Data Source
AI summary
There is provided a semiconductor light-emitting device including a base layer formed of a first conductivity-type semiconductor material, and a plurality of light-emitting nanostructures disposed on the base layer to be spaced apart from each other, and including first conductivity-type semiconductor cores, active layers, and second conductivity-type semiconductor layers. The first conductivity-type semiconductor cores include rod layers extending upwardly from the base layer, and capping layers disposed on the rod layers. Heights of the rod layers are different in at least a portion of the plurality of light-emitting nanostructures, and heights of the capping layers are different in at least a portion of the plurality of light-emitting nanostructures.