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Record solar cell efficiency achieved by French-German team

Posted: 05 Dec 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Soitec? CEA-Leti? Fraunhofer Institute for Solar Energy Systems? solar cell?

Collaborators from Soitec and CEA-Leti, France, together with the Fraunhofer Institute for Solar Energy Systems ISE, Germany have developed a multi-junction solar cell that has now set a world record for achieving 46 per cent efficiency.

Multi-junction solar cells are based on a selection of III-V compound semiconductor materials. The world record cell is a four-junction cell, and each of its sub-cells converts precisely one quarter of the incoming photons in the wavelength range between 300nm and 1750nm into electricity. When applied in concentrator PV, a small cell is used with a Fresnel lens, which concentrates the sunlight onto the cell. The record 46 per cent efficiency was measured at a concentration of 508 suns and has been confirmed by the Japanese AIST (National Institute of Advanced Industrial Science and Technology), one of the leading centres for independent verification of solar cell performance results under standard-testing conditions.

A special challenge that had to be met by this cell is the exact distribution of the photons among the four sub-cells. This has been achieved by precise tuning of the composition and thicknesses of each layer inside the cell structure. "This is a major milestone for our French-German collaboration. We are extremely pleased to hear that our result of 46 per cent efficiency has now been independently confirmed by AIST in Japan," said Frank Dimroth, project manager for the cell development at the German Fraunhofer Institute for Solar Energy Systems ISE. "CPV is the most efficient solar technology today and suitable for all countries with high direct normal irradiance."

Jocelyne Wasselin, VP solar cell product development for Soitec, a company headquartered in France, said: "It confirms we made the right technology choice when we decided to develop this four-junction solar cell, and clearly indicates that we can demonstrate a 50 per cent efficiency in the near future. To produce this new generation of solar cells, we have already installed a line in France. It uses our bonding and layer-transfer technologies and already employs more than 25 engineers and technicians. I have no doubt that this successful cooperation with our French and German partners will drive further increase of CPV technology efficiency and competitiveness."

- Paul Buckley
??EE Times Europe

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