Truncated Cuboidal Fin Light Article for Nanoscale LED Production
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Solution Overview
Problem
Conventional technologies face challenges in scaling production of second-generation or third-generation semiconductor devices due to limitations in uniform charging and efficient charge injection at the nanoscale, leading to reduced efficiency and increased costs in nanoscale light emitting diodes (LEDs) and other nanodevices.
Innovation Solution
The development of a light article comprising a truncated cuboidal fin with laterally-grown nanocrystals and facet-selective charge injection, allowing for controlled orientation and location of nanowires on a substrate, enabling efficient electron and hole injection and uniform light production across large areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional charging methods are used at the nanoscale, then device fabrication is simpler, but charge injection efficiency decreases and uniformity is poor
Solution Approach 1:
The device is segmented into distinct functional regions: a first region with a first dopant type and a second region with a second dopant type. This segmentation enables independent optimization of charge injection for each region, improving charge injection uniformity across the nanoscale device while maintaining a manageable structural complexity through clear functional division.
Solution Approach 2:
Different regions of the device are assigned different dopant types and concentrations tailored to their specific functional requirements. The first region is optimized for one type of charge carrier injection while the second region is optimized for the opposite type, allowing each local area to have the quality needed for its specific role in the device operation.
2Power
If nanoscale devices are scaled up for production, then output power density increases, but self-heating effects increase and efficiency droop occurs
Solution Approach 1:
The device structure is divided into multiple segments with alternating dopant types, creating a pattern that distributes current flow and heat generation across multiple regions. This segmentation reduces localized self-heating effects while maintaining high overall output power density by enabling efficient heat dissipation through the distributed architecture.
Solution Approach 2:
The dopant concentration and type are varied across different regions of the device to optimize electrical and thermal parameters. By changing the doping parameters locally, the device achieves better heat management and reduced efficiency droop while maintaining high power output, as the parameter variations enable more uniform current distribution and reduced hot spots.
3Productivity
If facet-selective charge injection is implemented, then charge injection efficiency improves, but manufacturing process complexity increases
Solution Approach 1:
The dopant regions are pre-formed during the device fabrication process before final assembly, with the first and second dopant types incorporated into their respective regions in advance. This preliminary action enables facet-selective charge injection functionality to be built-in during manufacturing rather than requiring complex post-fabrication modifications, thereby improving charge injection efficiency while keeping the manufacturing process manageable.
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 results in high-performance nanoscale LEDs with increased output power density and reduced self-heating, overcoming efficiency droop and cost limitations, enabling scalable production of bright, efficient nanoscale light sources and detectors.
Implementation Method 1
produces light in response to combining the electrons and the holes
Data Source
AI summary
A light article includes: a substrate; a truncated cuboidal fin disposed on the substrate and including: a laterally-grown nanocrystal including a longitudinal length and a lateral length that are different; a charge injection facet arranged along a longitudinal fin axis of the truncated cuboidal fin; and a truncation facet disposed opposing the charge injection facet and arranged parallel to the longitudinal fin axis; a side-injector disposed on the charge injection facet of the truncated cuboidal fin and that provides electrons to an active layer; and the active layer interposed between the side-injector and the substrate and that: receives electrons from the side-injector; receives holes from the substrate; and produces light in response to combining the electrons and the holes.