AlN–SiO2–Si:H Optical Interference Filters for Singulation Durability
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Solution Overview
Problem
Optical filters with alternating layers of aluminum nitride (AlN) and other materials face durability issues during singulation, leading to chipping, delamination, and performance degradation, resulting in a significant portion of defective filters.
Innovation Solution
Incorporating layers of silicon dioxide (SiO2) between aluminum nitride (AlN) and hydrogenated silicon (Si:H) layers to enhance durability, preventing the formation of low durability interfaces and reducing singulation defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alternating layers of aluminum nitride (AlN) and other materials are used in optical filters, then optical filtering performance is achieved, but durability during singulation deteriorates leading to chipping and delamination
Solution Approach 1:
A silicon oxide (SiO2) layer is introduced as an intermediary between the aluminum nitride (AlN) layer and the hydrogenated silicon (Si:H) layer. This intermediate layer prevents direct contact between the AlN and Si:H layers, eliminating the formation of low-durability interfaces that cause chipping and delamination during singulation. The SiO2 layer acts as a buffer that improves adhesion and mechanical strength at the interface.
Solution Approach 2:
The patent creates a composite layered structure consisting of AlN, SiO2, and Si:H layers. By combining materials with different mechanical and chemical properties, the composite structure achieves both the optical filtering performance of AlN and the improved durability provided by the SiO2 intermediate layer, preventing the harmful effects of direct AlN-Si:H interfaces.
2Manufacturing precision
If AlN and Si:H layers are directly interfaced, then device complexity is reduced, but manufacturing precision deteriorates due to interface durability issues
Solution Approach 1:
The silicon oxide layer serves as a mediator that improves interface durability between AlN and Si:H layers. Although this adds one more layer to the structure, the improvement in manufacturing precision and reduction in singulation defects outweighs the minor increase in structural complexity.
3Productivity
If singulation process is applied to AlN-based optical filters, then productivity is improved, but reliability deteriorates due to singulation defects
Solution Approach 1:
The silicon oxide layer is deposited in advance during the manufacturing process, before the singulation step. This preliminary action of creating a protective intermediate layer ensures that when singulation occurs later, the interfaces are already protected against chipping and delamination, thereby maintaining high yield rates while preserving manufacturing efficiency.
Solution Approach 2:
The SiO2 layer acts as a protective intermediary that enables the singulation process to proceed without causing excessive defects. This allows manufacturers to maintain high productivity through batch processing while achieving acceptable reliability by preventing interface failure during cutting and separation.
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
Improves the durability and reliability of optical filters, increasing yield and maintaining performance during operational life by minimizing defects and enhancing interface durability.
Implementation Method 1
Incorporating layers of silicon dioxide (SiO2) between aluminum nitride (AlN) and hydrogenated silicon (Si:H) layers to enhance durability, preventing the formation of low durability interfaces
Implementation Method 2
Optical interference filter includes a substrate, and a plurality of sets of layers that are disposed on the substrate
Data Source
AI summary
An optical interference filter includes one or more sets of layers. Each set of layers includes a first layer that includes at least aluminum and nitrogen (e.g., an aluminum nitride (AlN) material), a second layer that includes at least silicon and oxygen (e.g., a silicon dioxide (SiO2) material), and a third layer that includes at least hydrogen and silicon (e.g., a hydrogenated silicon (Si:H) material). The second layer is disposed between the first layer and the third layer.