New nanostructural layer enhances silicon solar cell efficiency

Photovoltaic solar cells convert sunlight into electricity; however, nearly half the light that reaches a flat silicon solar cell surface is lost to reflection. While traditional anti-reflective coatings help, they only work within a narrow margin of light frequency and incidence angles; now, researchers have designed a new type of anti-reflective coating using a single, ultrathin layer of polycrystalline silicon nanostructures (known as a metasurface). Achieving minimal reflection across certain wavelengths and angles, the metasurface was reportedly developed by combining forward and inverse design techniques, enhanced by artificial intelligence (AI).

The result is a coating that reduces sunlight reflection across a range of wavelengths and angles, setting a benchmark for performance with minimal material complexity. The coating works across the visible and near-infrared spectrum (500 to 1200 nm) and is effective even when the sunlight hits at steep angles. It reflects as little as 2% of incoming light at direct angles and approximately 4.4% at oblique angles.

The research findings, published in the journal Advanced Photonics Nexus, show that an intelligently designed nanostructural layer can boost the efficiency of mainstream solar panels. Because it is both high-performing and relatively simple, it could lead to more efficient solar panels, potentially speeding up the transition to clean energy.

Beyond solar energy, the approach also advances how scientists design metasurfaces for optics and photonics. It also opens the door to multifunctional photonic coatings that could benefit solar power, sensors and other optical devices.

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