Quantum Well Intermixing Layout for Stable Low-Current Emitters
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Solution Overview
Problem
Optoelectronic devices with impurity-induced quantum well intermixing experience significant degradation and reduced output power at low electrical current levels, unlike devices without quantum well intermixing.
Innovation Solution
A semiconductor structure and manufacturing method that involve applying a mask to protect parts of the active layer, doping the p-doped layer with a second dopant to induce quantum well intermixing in uncovered regions, and optimizing the process parameters to control the diffusion and annealing steps, thereby enhancing the aging stability of optoelectronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If quantum well intermixing is implemented to improve low-current efficiency, then low-current efficiency is improved, but aging stability deteriorates with significant degradation in output power
Solution Approach 1:
The patent applies different dopant concentrations and types in different spatial regions of the semiconductor structure. Specifically, it uses a first dopant in the p-doped layer and a second dopant in the n-doped layer with different concentration ranges, creating locally optimized regions that balance low-current efficiency improvement with aging stability preservation
Solution Approach 2:
The patent employs composite doping strategies combining multiple dopant types (first dopant and second dopant with different properties) in different layers. This composite approach allows the structure to benefit from the advantageous properties of each dopant while mitigating their individual drawbacks, particularly in balancing efficiency improvement with long-term stability
2Use of energy by moving object
If impurity diffusion is used to improve low-current efficiency, then low-current efficiency is improved, but device performance degrades at higher current densities
Solution Approach 1:
The patent implements spatially varying dopant concentrations where the first dopant in the p-doped layer and second dopant in the n-doped layer have different concentration profiles. This local optimization ensures that impurity diffusion benefits low-current efficiency in specific regions while maintaining high current density performance in other regions
Solution Approach 2:
The patent changes key parameters including dopant type, dopant concentration ranges (first dopant: 1×10^18 to 1×10^20 atoms/cm³, second dopant: 1×10^19 to 1×10^21 atoms/cm³), and layer composition to optimize both low-current efficiency and high-power output, demonstrating parameter optimization to resolve the contradiction
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
The proposed method improves the low-current efficiency and aging behavior of optoelectronic devices by reducing charge carrier concentration and luminescence efficiency degradation over time, maintaining high performance even at extended operation periods.
Implementation Method 1
a second dopant is diffused into the p-doped layer, wherein quantum well intermixing is generated in regions of the active layer
Implementation Method 2
a mask is applied and patterned on the semiconductor structure and in particular on the p-doped layer. The mask is adjusted to protect a portion of the active layer intended for the generation of electromagnetic radiation from the penetration of a second dopant
Implementation Method 3
The doping of the p-doped layer with the second dopant can be done, for example, by a gas phase diffusion using a precursor with the second dopant
Data Source
AI summary
A semiconductor structure comprises an n-doped first layer, a p-doped second layer doped with a first dopant, and an active layer disposed between the n-doped first layer and the p-doped second layer and having at least one quantum well. The active layer of the semiconductor structure is divided into a plurality of first optically active regions, at least one second region, and at least one third region. Here, the plurality of first optically active regions are arranged in a hexagonal pattern spaced apart from each other. The at least one quantum well in the active region comprises a larger band gap in the at least one second region than in the plurality of first optically active regions and the at least one third region, the band gap being modified, in particular, by quantum well intermixing. The at least one second region encloses the plurality of first optically active regions.