3D-printed external light trap for solar cells

Area of Science:

• Materials Science
• Optoelectronics
• Renewable Energy

Background:

• Conventional light trapping methods can impact solar cell material quality.
• Enhancing light absorption is crucial for improving solar cell efficiency.
• Optical losses limit the performance of thin-film solar cells.

Purpose of the Study:

• To develop and evaluate a universally applicable 3D-printed external light trap for solar cells.
• To improve light absorption and reduce optical losses in solar cells.
• To investigate the impact of external light trapping on solar cell performance.

Main Methods:

• Designed and 3D-printed an external light trap comprising a reflective parabolic concentrator and a reflective cage.
• Integrated the light trap onto the sun-facing surface of a thin-film nanocrystalline silicon (nc-Si:H) solar cell.
• Measured improvements in photocurrent and power conversion efficiency.
• Developed a theoretical model to predict absorption enhancement and analyzed angle of incidence effects.

Main Results:

• A 15% improvement in both photocurrent and power conversion efficiency was measured for the nc-Si:H solar cell.
• The external light trap effectively reduces optical losses by enabling multiple light traversals within the cell.
• The theoretical model showed good agreement with empirical data for path length enhancement.

Conclusions:

• The 3D-printed external light trap offers a non-invasive method to enhance solar cell absorption and efficiency.
• This technology is applicable to various solar cell types without compromising their intrinsic properties.
• External light trapping presents a promising strategy for advancing photovoltaic performance.