Electron Blocking Layer Doping Peak for Nitride LED Lifetime
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Solution Overview
Problem
Existing nitride semiconductor light-emitting elements face challenges in effectively suppressing the diffusion of p-type impurities into the active layer, which can lead to reduced luminous efficiency and shorter device life.
Innovation Solution
A nitride semiconductor light-emitting element is designed with an electron blocking layer that includes a peak-containing layer with a high n-type impurity concentration peak, which is at least 10 times the smallest value in its region, to prevent p-type impurity diffusion. This layer is formed with a specific Al composition ratio distribution and n-type impurity concentration profile to enhance electron blocking and reduce electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electron blocking layer is doped with n-type impurity, then diffusion of p-type impurity into the active layer is suppressed, but the doping is not effective enough in some cases
Solution Approach 1:
The electron blocking layer is designed with a non-uniform n-type impurity concentration distribution, creating a high-concentration region (peak) that locally enhances the suppression of p-type impurity diffusion. This local quality improvement allows the peak region to effectively block p-type impurity diffusion into the active layer, resolving the insufficiency of uniform doping.
Solution Approach 2:
The invention changes the parameter of n-type impurity concentration from a uniform distribution to a peaked distribution with a local maximum. This parameter change creates a high-concentration region that significantly enhances the ability to suppress p-type impurity diffusion, improving the effectiveness beyond simple uniform doping.
2Reliability
If uniform n-type impurity doping is applied throughout the electron blocking layer, then some suppression of p-type impurity diffusion is achieved, but the suppression effectiveness is insufficient
Solution Approach 1:
Instead of uniform doping, the invention implements local quality enhancement by creating a high-concentration n-type impurity peak region within the electron blocking layer. This localized high-concentration region provides superior suppression of p-type impurity diffusion while maintaining controllable manufacturing parameters.
Solution Approach 2:
The electron blocking layer is designed as a composite structure with regions of different n-type impurity concentrations. This composite doping structure combines low-concentration regions with a high-concentration peak region, achieving both effective impurity suppression and controlled manufacturing characteristics.
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 solution effectively suppresses p-type impurity diffusion, improving luminous efficiency and extending the life of the light-emitting element by maintaining high electron blocking efficiency while minimizing electrical resistance.
Implementation Method 1
a p-type impurity from the p-type semiconductor layer is attracted to the silicon in the electron blocking layer and diffusion of the p-type impurity into the active layer is suppressed
Data Source
AI summary
A nitride semiconductor light-emitting element includes an n-type semiconductor layer, a p-type semiconductor layer, an active layer, and an electron blocking layer comprising at least one layer. The at least one layer of the electron blocking layer includes a peak-containing layer having an n-type impurity concentration peak in an n-type impurity concentration distribution along a stacking direction. The n-type impurity concentration peak appears as a local maximum in the n-type impurity concentration distribution along the stacking direction in the peak-containing layer and has an n-type impurity concentration of not less than 10 times a smallest value of the n-type impurity concentration in a region along the stacking direction between positions that are separated from a position of the peak in the stacking direction on both sides in the stacking direction by 10% of a thickness of the peak-containing layer.