Researchers increase efficiency solar cells to 46 percent




The German Fraunhofer Institute and the French research institute CEA-Leti, a new record have earned for converting sunlight into electricity using solar cells. The new record is an efficiency of 46 percent and 50 is deemed feasible.

Multi-junction solar cell The researchers use so-called multi-junction solar cell with each subcell a quarter of the incident light to electricity sales. This involves photons having a wavelength of 300 to 1750nm. By focusing the light through a lens was Frensnel with 50,8W / cm² achieved a return of 46 percent, breaking the old record of 44.7 percent, which was by the same researchers in September last year earned . For the record was concentrated sunlight to an intensity corresponding to 508 “suns”, as reported Fraunhofer. The results have been confirmed by the independent Japanese research institute AIST.

The French and German scientists formed the correct distribution of the photons on the four sub-cells of the multi-junctioncel the toughest hurdle that had to be taken. By changing the thickness of each layer within the solar cell, and by modifications to the material composition would still be achieved a higher efficiency compared to previous designs.

Fraunhofer and CEA-Leti claim their concentrator photovoltaic technology is the most efficient and is particularly useful in areas where the sun has an intense irradiation. The researchers expressed the expectation that in the near future returns of 50 percent must be achieved. The developed cells are produced by Soltec.

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