Phosphate Quantum Cutting Material for Solar Efficiency
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Solution Overview
Problem
Solar cells and photovoltaic devices suffer from conversion inefficiency, as they can only effectively convert a portion of the solar spectrum, particularly the longer wavelengths, while shorter wavelengths (higher energy portions) are wasted, limiting their overall energy conversion efficiency.
Innovation Solution
A wavelength converting material comprising a phosphate compound with a chemical formula AB1-m-nPO4:Mm, Nn, where A is an alkali metal, B is an alkaline earth metal, M is a rare-earth sensitizer, and N is a rare-earth acceptor, which absorbs high-energy photons and emits two low-energy photons, specifically designed to enhance the conversion efficiency by emitting near-infrared light when excited by UV or blue light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If solar cells use conventional absorption mechanisms, then they can convert longer wavelengths (400-1100 nm) to electricity, but shorter wavelengths (lower than 400 nm) are wasted
Solution Approach 1:
The patent changes the optical parameters of the solar cell system by introducing a quantum cutting phosphor that absorbs UV photons (wavelength < 400 nm) and emits photons at wavelengths (800-1100 nm) that match the silicon cell's absorption range. This parameter transformation enables the cell to utilize previously wasted UV energy while maintaining compatibility with existing silicon-based photovoltaic technology.
Solution Approach 2:
The quantum cutting phosphor acts as an intermediary substance between the incoming solar radiation and the silicon solar cell. It receives high-energy UV photons that would otherwise be wasted or damaging, converts them through quantum cutting into two lower-energy photons, and delivers these to the silicon cell for electricity generation, thereby mediating the energy transfer process.
2Loss of energy
If a quantum cutting phosphor is introduced to convert UV photons to near-IR photons, then energy conversion efficiency improves, but the device structure becomes more complex
Solution Approach 1:
The patent employs composite material design by combining the quantum cutting phosphor with a binder material to form a phosphor composition. This composite structure integrates multiple functions: the phosphor particles provide the quantum cutting conversion, while the binder provides structural support, adhesion, and optical coupling. This approach simplifies the overall device architecture compared to using bare phosphor particles or multiple separate layers.
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 phosphate compound effectively converts UV or blue light into near-infrared light, increasing the energy conversion efficiency and maintaining thermal stability, with a significant increase in emission intensity at higher temperatures compared to commercial YAG:Ce phosphors, making it suitable for optoelectronic applications such as solar cells and LEDs.
Implementation Method 1
The mechanism of quantum cutting absorbs a high-energy photon and emits two low-energy photons. A quantum cutting phosphor (QC phosphor) based on the mechanism of quantum cutting could generate two low-energy photons corresponding to one incident high-energy photon
Implementation Method 2
M is a sensitizer comprising a rare-earth element, and N is an acceptor comprising a rare-earth element
Data Source
AI summary
A wavelength converting material comprising a phosphate compound have a chemical formula of AB1-m-nPO4:Mm, Nn, wherein A comprises an alkali metal element, B comprises an alkaline earth metal element, M is a sensitizer comprising a rare-earth element, and N is an acceptor comprising a rare-earth element, wherein 0<m≦0.3 and 0<n≦0.3.