Fluorescent Waveguide Lattices for Enhanced Light Harvesting and Solar Cell Performance

Area of Science:

• Materials Science
• Renewable Energy
• Optics

Background:

• Solar cells have a spectral response mismatch with the solar spectrum, limiting efficiency.
• Fluorescent down-conversion and light trapping are key strategies to enhance solar energy harvesting.

Purpose of the Study:

• To investigate fluorescent waveguide lattices as coatings for solar cells.
• To improve the spectral and angular response of solar cells using these novel materials.

Main Methods:

• Photopolymerization of acrylate and silicone resins with fluorescein comonomer to create waveguide lattices.
• Characterization of fluorescence emission, light redirection, and spectral/angular response.
• Integration of waveguide lattices as encapsulant coatings on commercial silicon solar cells.

Main Results:

• Waveguide lattices demonstrated bright green-yellow fluorescence via down-conversion of UV-blue light.
• Films effectively collected light from UV-vis-NIR across a wide angular range (±70°).
• Significant increases in solar cell current density were observed, up to 1.87 mA/cm² for dual lattices.

Conclusions:

• Fluorescent polymer waveguide lattices enhance solar cell performance by broadening spectral and angular light collection.
• Optimized dye concentrations and lattice structures are crucial for maximizing current generation.
• This technology holds significant potential for advancing solar cell efficiency and clean energy production.