Dual-Layer Anti-Reflective Coating for Durable Solar Modules
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Solution Overview
Problem
Anti-reflective coatings on solar modules degrade over time due to exposure to varying temperature and humidity conditions, leading to decreased performance.
Innovation Solution
A coated substrate with a dual-layer anti-reflective coating formulation comprising an inorganic oxide binder, elongated dense inorganic oxide particles with an aspect ratio of at least 2, and a porogen capable of forming pores, applied in a specific sequence to enhance durability and mechanical stability, with the second coating layer containing 0 to 30 wt-% aluminium oxide equivalents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional anti-reflective coating is applied on solar modules, then light transmission is improved and reflectivity is reduced, but the coating degrades over time due to temperature and humidity exposure
Solution Approach 1:
The coating is divided into two distinct layers: a first coating layer and a second coating layer. The first layer provides the anti-reflective optical function, while the second layer provides durability and environmental resistance. This segmentation allows each layer to be optimized for its specific function, resolving the contradiction between optical performance and durability.
Solution Approach 2:
The invention uses composite material composition with specific inorganic oxide particles (silica, alumina, zirconia) in controlled amounts within the coating formulation. This composite approach creates a coating that maintains optical transparency while gaining enhanced mechanical strength and environmental stability, thus improving durability without sacrificing light transmission.
2Reliability
If the coating formulation includes inorganic oxide particles and porogen, then durability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The invention specifies precise parameter ranges for inorganic oxide particle content (0.1-10 wt%) and porogen content (1-20 wt%) to achieve optimal durability. By controlling these parameters within defined ranges, the formulation balances durability improvement with manufacturing feasibility, avoiding excessive complexity while maintaining performance.
Solution Approach 2:
The porogen acts as an intermediary substance that creates a porous structure in the coating, which enhances durability by reducing internal stress and improving adhesion. This intermediary approach allows durability enhancement through a controlled mechanism rather than directly adding complex structural elements.
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 dual-layer coating significantly improves the durability of the anti-reflective coating, maintaining high transmission and reducing reflectivity, as demonstrated by a pressure cooker test, with a transmission difference of less than 0.2% after 48 hours, indicating enhanced resistance to environmental stress.
Implementation Method 1
a porogen capable of forming pores
Implementation Method 2
anti-reflective coating showing improved durability properties
Data Source
AI summary
A coated substrate comprising a coating layer comprising inorganic oxide and pores, the coating layer demonstrates improved durability properties. The coated substrate may for example be used in solar modules. Further a coating formulation and use of the coating formulation are disclosed.