Ultrawide-angle light collecting modules formed by direct light-writing of nanoparticle-based metallo-dielectric optical waveguides
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Solution Overview
Problem
Current solar cell encapsulant materials struggle to efficiently collect and convert non-normally incident light due to limited angular acceptance windows, leading to reduced light collection and conversion efficiency, especially at greater incident angles.
Innovation Solution
The integration of silver nanoparticles within a polymerized blend of polydimethylsiloxane and an optical adhesive, forming metallo-dielectric waveguide arrays that extend through the encapsulant resin, enhancing light collection by scattering and refractive index averaging, thereby expanding the acceptance window for light collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional encapsulant materials are used, then the solar cell structure is simple and easy to manufacture, but the angular acceptance window is limited and light collection efficiency at greater incident angles is reduced
Solution Approach 1:
The patent uses composite materials by combining silver nanoparticles with polymer encapsulant materials (polydimethylsiloxane and optical adhesive). This creates a metallo-dielectric composite that provides both the structural simplicity of conventional encapsulants and the enhanced light collection properties of nanoparticle-integrated materials, resolving the contradiction between manufacturing simplicity and light collection efficiency
Solution Approach 2:
The patent applies local quality by distributing silver nanoparticles specifically within the encapsulant material at strategic locations. Rather than uniformly modifying the entire encapsulant structure, the nanoparticles are localized to create scattering centers that expand the angular acceptance window while maintaining the overall simplicity of the encapsulant system
2Adaptability or versatility
If waveguide arrays are integrated into the encapsulant, then the acceptance window for light collection is expanded, but the device structure becomes more complex
Solution Approach 1:
The patent merges the waveguide functionality with the encapsulant material by integrating silver nanoparticles directly into the polymer encapsulant. This combination creates a unified structure where the encapsulant serves both its protective function and the light collection function, eliminating the need for separate waveguide components and reducing overall device complexity
Solution Approach 2:
The silver nanoparticles act as intermediaries that mediate between the incident light and the polymer encapsulant material. They enable the encapsulant to function as a waveguide by providing the necessary scattering and refractive index modulation, thereby achieving waveguide-like functionality without requiring complex waveguide structures
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 increases the external quantum efficiency and current density of solar cells across a wide range of incident angles, mitigating shadow losses and improving overall light collection and conversion efficiency.
Implementation Method 1
enhancing light collection by scattering and refractive index averaging
Implementation Method 2
enhancing light collection by scattering and refractive index averaging
Implementation Method 3
a photopolymerizable blend of a high refractive index polymer and a low refractive index polymer
Data Source
AI summary
A metallo-dielectric waveguide array used as an encapsulation material for silicon solar cells. The array is produced through light-induced self-writing combined with in situ photochemical synthesis of silver nanoparticles. Each waveguide comprises a cylindrical core consisting of a high refractive index polymer and silver nanoparticles homogeneously dispersed in its medium, all of which are surrounded by a low refractive index common cladding. These waveguide array films are processed directly over a silicon solar cell.