Solar Cell Protective Coating With UV Downshifting Nanocomposites
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Solution Overview
Problem
Solar cells used in space applications are prone to premature degradation due to exposure to ultraviolet (UV) sun radiation, cosmic radiation, and low-orbit atomic oxygen, leading to reduced operational lifetime and increased mission costs.
Innovation Solution
A polymer nanocomposite protective layer comprising spectrum-converting nanoparticles embedded in a colorless polymer is deposited on solar photovoltaic cells. This layer absorbs UV radiation, converts it into visible and near-infrared radiation, and blocks cosmic radiation and atomic oxygen, thereby enhancing the power conversion efficiency of the solar cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If solar cells are exposed to UV radiation and atomic oxygen in space, then they generate electricity from solar radiation, but they suffer premature degradation and shortened operational lifetime
Solution Approach 1:
The patent converts harmful UV radiation into beneficial visible light through downshifting phosphors embedded in the protective coating. The phosphors absorb UV radiation that would otherwise degrade the solar cell and re-emit it as visible light that the solar cell can convert into electricity, thus turning a harmful factor into a useful resource that simultaneously protects and enhances cell performance
Solution Approach 2:
The patent employs a composite protective coating containing downshifting phosphors embedded in a transparent matrix material. This composite structure combines the protective properties of the coating material with the light-conversion capabilities of the phosphors, creating a multi-functional layer that blocks atomic oxygen, converts UV to visible light, and maintains optical transparency for electricity generation
2Reliability
If a protective coating is applied to block UV radiation and atomic oxygen, then operational lifetime is extended, but power conversion efficiency may be reduced due to blocked visible radiation
Solution Approach 1:
The protective coating is designed with spatially differentiated functionality: the downshifting phosphors are concentrated in the coating layer to handle UV conversion, while the matrix material maintains high transparency in the visible spectrum. This local quality differentiation ensures that UV protection and visible light transmission occur in different spectral regions simultaneously, resolving the contradiction between protection and efficiency
Solution Approach 2:
The patent utilizes optical property changes by incorporating phosphors that change the spectral composition of transmitted light. The coating appears transparent to visible light while actively converting UV radiation, creating a selective optical filter that protects against harmful wavelengths while maintaining transmission of useful wavelengths for photovoltaic conversion
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 polymer nanocomposite coating increases the power conversion efficiency of solar cells by producing extra visible and near-infrared radiation, which contributes to additional electricity generation, while also protecting the cells from harmful radiation and atomic oxygen, thus extending their operational lifetime.
Implementation Method 1
The UV component is absorbed by the NPs and spectrally converted into visible (and NIR) radiation
Implementation Method 2
The layer also blocks cosmic radiation and low-orbit atomic oxygen (AO) from reaching the solar cell
Data Source
AI summary
A protective coating for solar cells and the method of its making. The coating consists of four sub-coatings: the first, second, and the third polymer nanocomposite coatings and the optical anti-reflection coating on the top. The anti-reflection coating minimizes the reflection of the incident sun light and is made by embedding silica nanoparticles in the third coating. The third coating protects the solar cell for the low-orbit atomic oxygen and transmits the sunlight further down. The second polymer nanocomposite coating is composed of a colorless polymer embedded with the nanoparticles of a compound absorbing sun UV radiation and converting it into visible and NIR radiation suitable for generating electricity by the cell. The first nanocomposite layer is made of a colorless polymer nanocomposite blocking the residual harmful UV and atomic oxygen from reaching the cell and shortening its operational lifetime.