GaN LED Sidewall Passivation for Leakage Reduction
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Solution Overview
Problem
GaN-based light-emitting diodes (LEDs) face challenges with leakage and reduced service life due to non-radiative recombination and defects on sidewalls, which affect luminous efficiency and yield rates in manufacturing.
Innovation Solution
A GaN-based LED structure with a nitrogen-containing passivation layer, such as AlN, SiN, or GaN, is epitaxially grown on the sidewalls, combined with an annealing process to repair defects and reduce non-radiative recombination, and a patterned mask layer is used to form active and inactive regions, enhancing the LED's dynamic characteristics and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If GaN-based LED structure is manufactured without sidewall passivation, then manufacturing process is simple, but non-radiative recombination occurs and service life is reduced
Solution Approach 1:
A nitrogen-containing passivation layer is introduced as an intermediary substance between the GaN-based LED structure and the external environment. This passivation layer specifically targets and passivates sidewall defects, reducing non-radiative recombination centers without requiring complete structural redesign. The layer acts as a mediator that protects the active regions while maintaining manufacturing feasibility
Solution Approach 2:
The patent applies passivation selectively to the sidewall regions where defects and non-radiative recombination occur most frequently. By using patterned mask layers during the epitaxial growth process, the nitrogen-containing passivation layer is deposited only in specific locations (sidewalls and inactive regions) rather than uniformly across the entire structure. This localized approach reduces overall device complexity while targeting the specific problem areas that affect service life
2Loss of energy
If nitrogen-containing passivation layer is added to sidewalls, then non-radiative recombination is reduced, but manufacturing process complexity increases
Solution Approach 1:
The nitrogen-containing passivation layer is grown during the epitaxial growth process itself, before the LED structure is completed and before it undergoes separate passivation steps. By incorporating the passivation layer formation into the existing MOCVD growth process, the patent avoids adding a completely new manufacturing step. The passivation occurs preliminarily during the growth phase, reducing the need for subsequent complex manufacturing operations
Solution Approach 2:
The nitrogen-containing passivation layer serves multiple functions simultaneously: it passivates sidewall defects to reduce non-radiative recombination, protects the LED structure during subsequent processing steps, and can be integrated into the existing epitaxial growth workflow. This multi-functionality reduces the need for separate dedicated passivation processes, thereby simplifying the overall manufacturing complexity despite the added functional capability
3Reliability
If patterned mask layer is used to form active and inactive regions, then LED dynamic characteristics are enhanced, but device complexity increases
Solution Approach 1:
The patent divides the LED structure into distinct active and inactive regions using patterned mask layers during epitaxial growth. This segmentation allows different areas of the device to have optimized properties: active regions for light emission and inactive regions for current blocking and structural support. By segmenting the structure during the growth phase rather than requiring complex post-processing, the patent enhances dynamic characteristics while managing complexity through process integration
Solution Approach 2:
The patterned mask layer approach adds a dimensional aspect to the LED structure by creating lateral variations in composition and properties across the device surface. Instead of uniform structures, the patent introduces spatial variation in the form of patterned active and inactive regions. This dimensional approach allows for enhanced dynamic characteristics through controlled current distribution and optical field management, while the patternning is achieved during growth rather than requiring complex three-dimensional assembly later
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 reduces non-radiative recombination, prevents electrical leakage, and prolongs the service life of GaN-based LEDs by passivating sidewalls and improving the dynamic characteristics, thereby increasing the yield and efficiency of light-emitting devices.
Implementation Method 1
a nitrogen-containing passivation layer located on a sidewall of the GaN-based LED structure; wherein the GaN-based LED structure includes: a first semiconductor layer, a second semiconductor layer, and a light-emitting layer located between the first semiconductor layer and the second semiconductor layer
Implementation Method 2
combined with an annealing process to repair defects and reduce non-radiative recombination
Data Source
AI summary
The present disclosure provides a light-emitting structure and a manufacturing method thereof. The light-emitting structure includes: a GaN-based LED structure and a nitrogen-containing passivation layer located on a sidewall of the GaN-based LED structure; wherein the GaN-based LED structure includes: a first semiconductor layer, a second semiconductor layer, and a light-emitting layer located between the first semiconductor layer and the second semiconductor layer, conductivity types of the first semiconductor layer and the second semiconductor layer are opposite.