Universidad Politécnica de Madrid

Instituto de energía solar


Novel CPV concepts


We are constantly introducing innovations in concentrator photovoltaic systems in order to increase conversion efficiency, reduce costs and develop the full potential of CPV as a low-cost electricity generation technology. Many novel system architectures, optical systems or manufacturing processes have been proposed by our group through the years:

  • Notably, the silicone-on-glass (SOG) Fresnel technology was patented by Prof. Sala in the late 70s, which was later massively adopted by the CPV industry for the large-scale deployment of the technology.

  • In recent years, another hybrid lens architecture, named Achromatic Doublet on Glass (ADG), has been proposed for reducing chromatic aberration losses in refractive concentrators, which allows for a larger geometrical concentration factor while preserving optical efficiency. The new achromatic ADG lens is able of attaining a concentration three times higher than the equivalent SOG Fresnel lens saving the need of a SOE and reducing the system cost.

  • Other innovative optical systems recently investigated include the Fluid Reflex concentrator, based on a single stage reflective optics by means of an optical fluid that additionally improves the light coupling and heat dissipation from the cell.

  • We have also investigated hybrid lighting-CPV systems, a module approach that combines PV energy generation and direct lighting by means of optical fibers to be used on rooftops.

Contact person: Prof. Ignacio Antón




Selected publications    
  1. WO2015101626 A1. “Lens having limited chromatic aberration for photovoltaic concentrators and method for manufacturing said lens”

  2. M. Victoria et Al. "Experimental analysis of a photovoltaic concentrator based on a single reflective stage immersed in an optical fluid", Progress in Photovoltaics: Research and Applications 22:12 (2014), p 1213-1225.

  3. R. Núñez et Al. "Development of a full hybrid lighting-CPV prototype and savings in a real case operation", American Institute of Physics Conference Series. Vol. 1616. 2014.

  4. G. Sala and E. Lorenzo. “Hybrid silicone-glass Fresnel lens as concentrator for photovoltaic applications”, 2nd EUPVSEC (1979), Berlin

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