Hierarchical Nanostructured Packaging Glass for Solar Cells
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Solution Overview
Problem
Optical devices, such as solar cells, face issues with high reflectivity and poor self-cleaning capabilities due to flat packaging glass surfaces, which hinder light transmission and efficiency.
Innovation Solution
A hierarchical nanostructure is fabricated on the packaging glass, comprising nanorods and honeycomb nanowalls that reduce reflectivity and enhance light transmission across a wide range of wavelengths, while providing superior self-cleaning properties by minimizing surface contact area and promoting hydrophobicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat surface is used for packaging glass, then the manufacturing process is simple, but the reflectivity is high and light transmission is reduced
Solution Approach 1:
The surface is segmented into multiple hierarchical levels: macro-scale pyramidal structures (5-50 μm) divided into micro-scale facets (1-10 μm), which are further divided into nano-scale features (100 nm - 1 μm). This multi-level segmentation creates progressive light scattering that reduces reflection while maintaining manufacturing feasibility through sequential processing steps.
Solution Approach 2:
The invention transitions from a two-dimensional flat surface to a three-dimensional hierarchical structure by adding vertical depth (5-50 μm pyramidal height) and multiple spatial scales. This dimensional transformation enables light to undergo multiple scattering events at different scales, significantly reducing reflectivity while the structures remain integrated within the glass substrate.
2Area of stationary object
If a flat surface is used for packaging glass, then the surface area is maximized, but self-cleaning capabilities are poor due to particle adhesion
Solution Approach 1:
The hierarchical surface features exhibit curved geometries at multiple scales: spherical-ish pyramidal tips, rounded micro-facets, and nano-scale convexities. These curved surfaces minimize contact area between the glass and adhering particles, enabling particles to roll off more easily and improving self-cleaning capability while maintaining adequate surface area for light interaction.
3Loss of energy
If a hierarchical nanostructure is fabricated on packaging glass, then reflectivity is reduced and light transmission is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The invention merges multiple functional structures into a single integrated hierarchical feature set. The pyramidal structures, micro-facets, and nano-features are combined into one unified surface treatment that simultaneously provides anti-reflection, light scattering, and self-cleaning functions, reducing the need for separate components or processing steps.
Solution Approach 2:
The hierarchical structures utilize parameter optimization across multiple scales: pyramidal pitch (5-50 μm), facet size (1-10 μm), and nano-feature dimensions (100 nm - 1 μm). By carefully controlling these parameters, the design achieves effective light management across the solar spectrum while maintaining compatibility with existing glass manufacturing processes through parameter-based rather than structurally complex solutions.
4Reliability
If a hierarchical nanostructure is fabricated on packaging glass, then self-cleaning capabilities are improved through hydrophobicity, but the manufacturing process becomes more difficult
Solution Approach 1:
The hierarchical surface structure provides self-service by creating inherent hydrophobicity through its geometry alone. The multi-scale convex features cause water and contaminants to bead up and roll off without requiring additional chemical coatings or maintenance interventions. This geometric self-service approach to hydrophobicity avoids the complexity of applying and maintaining separate hydrophobic coatings.
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 hierarchical nanostructure significantly enhances optical transmittance, power conversion efficiency, and self-cleaning capabilities, allowing solar cells to effectively utilize incident light from various angles and maintain performance over extended periods, even in dusty conditions.
Implementation Method 1
a hierarchical nanostructure fabricated on the surface of the packaging glass which acts to reduce reflections of the incident light
Implementation Method 2
packaging glass has a relatively low refractive index, and is therefore a good choice for protecting/encasing the active regions of optical devices as light is allowed to travel relatively freely through the packaging glass
Implementation Method 3
providing superior self-cleaning capabilities by minimizing surface contact area and promoting hydrophobicity
Data Source
AI summary
An optical device includes an active region and packaging glass located on top of the active region. A top surface of the packaging glass includes hierarchical nanostructures comprised of honeycombed nanowalls (HNWs) and nanorod (NR) structures extending from the HNWs.