VCSEL Mirror Doping for Reflectivity and Density
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Solution Overview
Problem
In semiconductor components with epitaxially deposited mirrors, doping can negatively affect reflectivity and interface quality, and traditional contact methods require additional space and complex etching processes, limiting the density of individually controllable regions.
Innovation Solution
A radiation-emitting semiconductor component with epitaxially deposited semiconductor layers, where the n-conducting mirror region is formed after the active region, using alternative dopants like Te, Sn, or Se to enhance reflectivity, and a tunnel junction facilitates charge carrier injection without material bonding between the carrier and semiconductor layer sequence, allowing for high-density, independently controllable segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon doping is used in the mirror region, then electrical conductivity is improved, but reflectivity and interface quality deteriorate
Solution Approach 1:
The patent applies local quality by using different dopants for different regions: silicon doping is used in the carrier and contact regions where electrical conductivity is prioritized, while alternative dopants (Te, Sn, Se) are used in the mirror regions where reflectivity and interface quality are critical. This spatial differentiation of doping strategies resolves the contradiction between conductivity and interface quality.
Solution Approach 2:
The patent changes the doping parameter by substituting silicon with alternative dopants (Te, Sn, Se) in the mirror regions. This parameter change maintains electrical conductivity through the mirror regions while preserving reflectivity and interface quality, as these alternative dopants have different segregation behaviors and lower negative impact on the DBR structure.
2Reliability
If contacts are made through the Bragg mirror, then electrical connection is achieved, but additional space and complex etching steps are required
Solution Approach 1:
The patent merges the electrical contact function with the mirror structure by making the mirror regions themselves electrically conductive through alternative doping. This eliminates the need for separate contact holes through the Bragg mirror, as the mirror regions can directly serve as electrical contacts while maintaining their optical function.
Solution Approach 2:
The patent extracts the complex etching step from the manufacturing process by eliminating the need to create contact holes through the Bragg mirror. The alternative doping approach allows electrical contacts to be formed without penetrating the mirror structure, thereby removing this complex processing step.
3Reliability
If traditional doping methods are used in mirror regions, then electrical conductivity is achieved, but maximum segment density is reduced
Solution Approach 1:
The patent combines multiple functions into the mirror regions: optical reflection, electrical conduction, and contact function. By making the mirror regions conductive through alternative doping, individual segments can be controlled independently without requiring additional space for separate contact structures, thereby maximizing segment density.
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 design achieves high reflectivity and crystal quality for the mirror regions, enabling efficient radiation generation with improved operational efficiency and simplified production, particularly in VCSELs, by reducing defect densities and eliminating the need for complex contact structures.
Implementation Method 1
a tunnel junction is formed between the p-conducting mirror region and the carrier. The tunnel junction is configured to facilitate charge carrier injection from the carrier into the p-conducting mirror region
Implementation Method 2
the semiconductor layer sequence is epitaxially deposited on the carrier
Implementation Method 3
an active region configured for generating radiation... charge carriers can be injected into the active region from opposite sides via the mirror regions and recombine there, emitting radiation
Data Source
AI summary
A radiation-emitting semiconductor component is disclosed. In an embodiment, a component includes a semiconductor layer sequence and a carrier on which the semiconductor layer sequence is arranged, wherein the semiconductor layer sequence comprises an active region configured for generating radiation, an n-conducting mirror region and a p-conducting mirror region, wherein the active region is arranged between the n-conducting mirror region and the p-conducting mirror region, and wherein the p-conducting mirror region is arranged closer to the carrier than the active region.