Low-Reflection Coating for Photoelectric Devices
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Solution Overview
Problem
Existing low-reflection coatings on glass substrates for photoelectric conversion devices are prone to damage or contamination during the production process, and they do not provide sufficient transmittance gain, limiting the efficiency of these devices.
Innovation Solution
A low-reflection coating comprising solid, spherical fine silica particles and a binder containing silica and an aluminum compound, applied after the photoelectric conversion device is produced, which offers a transmittance gain of 2.5% or more without the need for high-temperature treatment, and provides high salt spray resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a low-reflection coating is applied to a glass substrate for photoelectric conversion devices, then the transmittance gain is improved, but the coating is prone to damage or contamination during the production process
Solution Approach 1:
The patent applies the low-reflection coating after the photoelectric conversion device is produced, rather than before. This preliminary action (applying coating post-assembly) prevents the coating from being damaged or contaminated during the production process, while still achieving the desired transmittance gain of 2.5% or more.
2Illumination intensity
If conventional low-reflection coatings are used, then the coating can be applied, but the transmittance gain is insufficient
Solution Approach 1:
The patent changes the parameters of the coating composition by incorporating aluminum compounds into the binder, which enhances the transmittance gain to 2.5% or more. This parameter change in the coating formulation directly improves the coating performance without complicating the manufacturing process.
3Reliability
If high-temperature treatment is applied to the coating, then the coating properties can be improved, but the production process becomes more complex
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by adding aluminum compounds, which allows the coating to achieve high stability and salt spray resistance without requiring high-temperature treatment. This parameter change in composition eliminates the need for complex high-temperature processing steps.
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 coating achieves a significant transmittance gain and improved salt spray resistance, maintaining performance even after exposure to environmental conditions, enhancing the efficiency and durability of photoelectric conversion devices.
Implementation Method 1
a porous film including: fine silica particles being solid and spherical; and a binder containing silica as a main component... The porous film has a physical thickness of 80 to 800 nm
Data Source
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AI summary
A low-reflection coating of the present invention is a porous film including fine silica particles being solid and spherical and having an average particle diameter of 80 to 150 nm; and a binder containing silica as a main component, the fine silica particles being bound together by the binder. The binder further contains an aluminum compound. The low-reflection coating contains, as components, 55 to 70 mass% of the fine silica particles, 25 to 40 mass% of the silica of the binder, and 2 to 7 mass% of the aluminum compound in terms of Al2O3. The low-reflection coating has a thickness of 80 to 800 nm. The low-reflection coating yields a transmittance gain of 2.5% or more when provided on the substrate. The transmittance gain represents an increase in average transmittance of the substrate provided with the low-reflection coating relative to the substrate not provided with the low-reflection coating, the average transmittance being measured in the wavelength range of 380 to 850 nm.