Cosine light-trapping nanostructures for thin film solar cells.

In this Letter, we present a cosine light-trapping texture for thin-film silicon solar cells. The surface texture was numerically demonstrated to exhibit comparable light-trapping performance to the inverted pyramid one, which is classic high-efficiency light-trapping structure. The cosine texture can be directly formed by interference lithography, while the inverted pyramid needs more complicated processing. The proposed structure has the potential to play a key role in thin-film solar cells.