Metal-Halide Downconversion Layers for Silicon PV Photon Mismatch
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Solution Overview
Problem
Conventional photovoltaic devices face inefficiencies in converting high-energy ultraviolet and blue solar photons into electricity, limiting their overall energy conversion efficiency and being expensive compared to fossil fuels.
Innovation Solution
The use of quantum-cutting downconversion layers, particularly metal-halide perovskites and elpasolites doped with lanthanides, which absorb high-energy photons and emit lower-energy photons, enhancing the efficiency of solar energy conversion by up to 39% and reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional photovoltaic devices are used to convert solar photons into electricity, then electricity generation is achieved, but high-energy ultraviolet and blue photons are inefficiently converted, limiting overall energy conversion efficiency
Solution Approach 1:
A quantum-cutting downconversion layer is introduced as an intermediary between the solar spectrum and the photovoltaic device. This layer absorbs high-energy ultraviolet and blue photons and converts them into multiple lower-energy photons that match the bandgap of the silicon PV, enabling efficient energy transfer and eliminating the mismatch between solar spectrum and PV absorption characteristics
Solution Approach 2:
The downconversion layer changes the energy parameters of incident photons by converting one high-energy photon into multiple lower-energy photons through quantum-cutting processes. This parameter transformation allows the photovoltaic device to utilize previously wasted high-energy photons effectively, boosting overall energy conversion efficiency beyond the conventional 29% thermodynamic limit
2Ease of manufacture
If conventional photovoltaic devices are deployed, then solar energy conversion is achieved, but the cost of raw materials and assembly creates a lower price limit that is difficult to overcome
Solution Approach 1:
The invention employs metal-halide perovskite and elpasolite materials as composite downconversion layers that can be processed using solution or vapor methods. These materials combine desirable optical properties with ease of fabrication, enabling cost-effective manufacturing while achieving high quantum yields and improved energy conversion efficiency
Solution Approach 2:
The downconversion layer uses materials that can be deposited as thin films using low-cost solution processing or vapor deposition techniques. This approach replaces expensive multi-junction semiconductor structures with simpler, cheaper material systems that achieve comparable or superior performance through quantum-cutting downconversion
3Productivity
If conventional silicon photovoltaic devices are used, then electricity generation is achieved, but efficiency is asymptotically approaching fundamental thermodynamic limits
Solution Approach 1:
The quantum-cutting downconversion layer serves as an intermediary that transforms the solar spectrum before it reaches the silicon PV, enabling the system to overcome the thermodynamic limits of direct silicon photon conversion. By converting high-energy photons into multiple lower-energy photons, the system achieves efficiencies projected up to 39%, surpassing the 29% limit of conventional silicon PV
Solution Approach 2:
The solar energy conversion process is segmented into two distinct stages: first, the downconversion layer absorbs high-energy photons and emits multiple lower-energy photons; second, the silicon PV converts these downconverted photons into electricity. This segmentation allows each component to operate in its optimal efficiency range, with the downconversion layer handling high-energy photons and the silicon PV handling lower-energy photons
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
This approach significantly improves the efficiency of solar energy conversion by transforming high-energy photons into more usable lower-energy photons, potentially making solar energy more competitive with fossil fuels and overcoming the thermodynamic limits of conventional silicon-based PVs.
Implementation Method 1
Quantum-cutting downconversion layers at the front surfaces of solar cells can reduce these losses by transforming high-energy photons into lower energy photons that are more easily absorbed by the underlying PV. In addition, quantum-cutting downconverters convert high-energy solar photons into lower-energy photons with quantum yields that exceed 100%
Implementation Method 2
The ionic nature of these lattices has allowed for the inclusion of a number of aliovalent impurities, most notably the lanthanides. The lanthanides are a group of elements in the periodic table that are mostly stable in their trivalent ionic form with the electronic configuration 4f^n5s^25p^6 where n varies from 0 to 14. The partly filled 4f inner electron shell of the lanthanides is shielded from the surrounding environment by the outer filled 5s and 5p electron shells giving rise to characteristic optical and magnetic properties
Data Source
AI summary
Compositions of matter, downconversion layers including the compositions of matter, and devices including the compositions of matter are described. In an embodiment, the compositions of matter are downconversion materials configured to absorb a quantum of energy of a first energy and, in response, emit two or more quanta of energy of a second energy less than the first energy. Methods of making and depositing downconversion materials are also described. Downconversion precursor mixtures suitable for making downconversion materials and methods of making the same are also described.