Remarkable Enhancement of Solar Cell Conversion Efficiency

Photo-, thermo-, and moisture-stable Chameleon luminophore film for enhancement of solar cell conversion efficiency

The chameleon luminophore* technology announced in Hokkaido University’s press release in 2013 has been applied to solar cells.・This technology can be applied to silicon solar cells all over the world.

The technology increases conversion efficiency by 2%—which means that the technology can save up to three years’ worth of the electrical energy consumed in Hakodate City (5,000,000 kW)

Overview
By applying the chameleon luminophore technology (technology that emits different colors in response to temperature changes; announced in May 2013) to silicon solar cells, the study group has succeeded in increasing the light energy conversion efficiency by 2%. This rate of increase is a world record. A durability test showed that this new technology can be used for up to 10 years, and it is considered a practical component for upgrading silicon solar cells.

Expectations
Use of this new technology will lead to saving a significant amount of energy. This new concept of wavelength conversion film can be applied worldwide, and it is expected to make a major contribution to solving future energy issues. An international patent for the result of this study was applied for as part of international publication number: WO2012/150712 (international publication date: November 8, 2012). This remarkable performance will be reported in the international chemistry journal, Bull. Chem. Soc. Jpn in the near future.
Chameleon luminophore

Chameleon luminophore is a new molecule type luminophore containing the rare earth element, europium, and emits different colors in response to temperature changes. The special structure of this luminophore can withstand up to 300°C, and can sense temperatures from -80°C to 220°C. Chameleon luminophore may be applied to the design and development of spacecraft capable of atmospheric reentry and ultra-high-speed rail (International chemistry journal, Angew. Chem. Int. Ed. 52, 6413-6416 (2013)).