The Fraunhofer Institute for Solar Energy Systems ISE has been successfully developing concentrator photovoltaic (CPV) technology for many years.
In this technology Fresnel lenses are used to bundle sunlight and focus it onto miniature, highly efficient solar cells.
36.7 Percent for New Solar Module Using Highly Efficient Multi-Junction Solar Cells
The FLATCON® module technology originates from Fraunhofer ISE and is continually under further development at the Institute. Now with their newest CPV module technology, the Freiburg researchers announce a world record module efficiency of 36.7 %, achieved by adapting the concentrating lens to a new solar cell structure.
The high module efficiency was measured under Concentrator Standard Testing Conditions, or CSTC, and marks the best value ever achieved for a photovoltaic module.
Decisive in this achievement was Soitec’s newly developed four-junction solar cell based on the wafer bonding technology and developed in cooperation with Fraunhofer ISE.
Recently this four-junction solar cell could be implemented into the Institute’s FLATCON® module concept. The module aperture area, defined as the surface area of the module exposed to light, is 832 cm². The sunlight is concentrated by a factor of 230 suns onto fifty-two 7 mm² miniature solar cells with the help of fifty-two 16 cm² Fresnel lenses.
Sources :
http://www.ise.fraunhofer.de/en/press-and-media/press-releases/press-releases-2014/new-world-record-for-concentrator-photovoltaics
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