The eyes of moths²（飞蛾） , which allow them to see well at night, are also covered with a water-repellent（排斥的，防水的） , antireflective coating that makes their eyes among the least reflective surfaces in nature and helps them hide from predators³ in the dark. Mimicking⁴ the moth¹ eye's microstructure, a team of researchers in Japan has created a new film, suitable for mass-production, for covering solar cells that can cut down on the amount of reflected light and help capture more power from the sun. In a paper appearing in Energy Express (www.OpticsInfoBase.org/ee), a bi-monthly supplement to Optics Express, the open-access journal published by the Optical Society (OSA), the team describes how this film improves the performance of photovoltaic modules⁶（太阳光电模块） in laboratory and field experiments, and they calculate how the anti-reflection film would improve the yearly performance of solar cells deployed⁷ over large areas in either Tokyo, Japan or Phoenix⁸, Ariz.

"Surface reflections are an essential loss for any type of photovoltaic module⁵, and ultimately low reflections are desired," says Noboru Yamada, a scientist at Nagaoka University of Technology Japan, who led the research with colleagues at Mitsubishi Rayon Co. Ltd. and Tokyo Metropolitan⁹ University.

The team chose to look at the effect of deploying¹⁰ this antireflective moth-eye film on solar cells in Phoenix and Tokyo because Phoenix is a "sunbelt" city, with high annual amount of direct sunlight, while Tokyo is well outside the sunbelt region with a high fraction of diffuse¹¹（弥漫的，散开的） solar radiation.

They estimate that the films would improve the annual efficiency of solar cells by 6 percent in Phoenix and by 5 percent in Tokyo.

"People may think this improvement is very small, but the efficiency of photovoltaics is just like fuel consumption rates of road vehicles," says Yamada. "Every little bit helps."

Yamada and his colleagues found the inspiration for this new technology a few years ago after they began looking for a broad-wavelength and omnidirectional（全方向的） antireflective structure in nature. The eyes of the moth were the best they found.

The difficulty in making the film, says Yamada, was designing a seamless（无缝的） , high-throughput roll-to-roll process for nanoimprinting the film. This was ultimately solved by Hideki Masuda, one of the authors on the Energy Express paper, and his colleagues at Mitsubishi Rayon Co. Ltd.

The team is now working on improving the durability¹² of the film and optimizing¹³ it for many different types of solar cells. They also believe the film could be applied¹⁴ as an anti-reflection coating to windows and computer displays.