Spectral Light Concentration for High-Efficiency Multi-Cell Solar Conversion
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Solution Overview
Problem
Conventional solar photovoltaic (PV) cells have low efficiency and high costs, requiring large areas to generate a desired amount of electrical power, which can be offset by the abundance and cost-effectiveness of sunlight.
Innovation Solution
A concentrating photovoltaic system that uses optical elements to focus sunlight onto small PV cells, incorporating light-converging elements and a light guiding structure to spectrally partition light and direct it to multiple energy conversion elements, optimizing energy concentration and reducing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional PV cells are used to generate electrical power, then the system is simple in structure, but the efficiency is low and large area is required
Solution Approach 1:
The patent segments the solar spectrum into multiple wavelength bands and uses different PV cells optimized for each band. This spectral segmentation allows each cell type to operate at peak efficiency in its designated range, dramatically improving overall system productivity while reducing the total area needed compared to using a single type of PV cell.
Solution Approach 2:
The patent changes the optical parameters of the system by introducing wavelength-selective optical elements that direct different spectral components to different PV cells. This parameter change enables the system to capture and convert a broader range of sunlight wavelengths, increasing energy generation efficiency per unit area.
2Quantity of substance
If PV cell area is reduced to lower cost, then material cost decreases, but efficiency must be improved to maintain power output
Solution Approach 1:
By segmenting the spectrum and using multiple specialized PV cells, the system achieves high efficiency with reduced total material quantity. Each cell type is optimized for specific wavelength ranges, allowing the system to maintain high power output while using less overall PV cell material compared to a single-cell approach.
Solution Approach 2:
The patent employs a composite system combining multiple types of PV cells with different spectral responses. This composite approach allows the system to utilize a broader portion of the solar spectrum effectively, achieving high productivity with reduced material quantity by optimizing each component's contribution.
3Productivity
If multiple PV cells are used for spectral partitioning, then spectrum utilization increases, but device complexity increases
Solution Approach 1:
The patent designs optical elements that perform multiple functions: wavelength separation, light guiding, and focal point positioning. This multi-functionality reduces the number of separate components needed, thereby limiting device complexity while still achieving high spectrum utilization through multiple PV cells.
Solution Approach 2:
The patent introduces light guiding structures as intermediary elements that simplify the optical path between the wavelength-selective elements and the multiple PV cells. These intermediaries manage light distribution efficiently, reducing system complexity while maintaining high spectral utilization.
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 system achieves high-level light energy concentration, reduces operating temperatures, and provides a compact, efficient, and cost-effective solar power-generating device by utilizing multiple types of PV cells optimized for different spectral ranges, thereby increasing overall sunlight spectrum utilization.
Implementation Method 1
Light-converging elements may concentrate incident sun light onto light splitting and/or directing elements
Implementation Method 2
a light splitting and/or directing element may spectrally partition converging light to produce light having a first spectral component and light having a second spectral component
Implementation Method 3
CPV technology is a relatively important method for converting sun energy into electricity
Data Source
AI summary
An optical system for light energy concentration may comprise a light concentrator including two or more light-converging elements, a light splitting element to receive the converging light from the light-converging elements and to produce light having a first spectral component and light having a second spectral component, and a light directing element to direct the light having the first spectral component through a light guide and to direct the light having the second spectral component to a location external to the light guide.