Light trapping in horizontally aligned silicon microwire solar cells

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Traditional solar cells face limitations in light absorption and flexibility.
• Efficient light trapping is crucial for enhancing photovoltaic performance.

Purpose of the Study:

• To demonstrate a novel solar cell design utilizing horizontally aligned silicon microwires.
• To evaluate the light absorption capabilities of these microwire solar cells.

Main Methods:

• Fabrication of horizontally aligned silicon microwires using the molten core fiber drawing method.
• Characterization of light absorption in microwire arrays with varying packing densities.
• Fabrication of prototype solar cells to validate the concept.

Main Results:

• A microwire solar cell structure with 50 μm diameter wires achieved 86% absorption up to 850 nm.
• Arrays with a packing fraction of 0.35 demonstrated 58% absorption, indicating effective light trapping.
• Prototype cells confirmed the feasibility of the horizontal wire design.

Conclusions:

• Horizontally aligned silicon microwire solar cells offer efficient light absorption and trapping.
• The design presents advantages such as flexibility, partial transparency, and broad angle light absorption.
• This technology holds promise for advanced photovoltaic applications.