The FLATCON System from Concentrix Solar

Part of the Springer Series in Optical Sciences book series (SSOS, volume 130)


Concentrix Solar GmbH (Freiburg, Germany) is a company that was founded with the aim of launching an innovative technology based on high-concentration photovoltaic (PV) cells. The technology is based on development work at Fraunhofer ISE in Freiburg, Germany. Some of the essential features of this technology go back to 1993 when Fraunhofer ISE published the results obtained for a concentrator test module using single-junction GaAs solar cells made by liquid-phase epitaxy (LPE) [1–3].

Figure 14.1 shows the concentrator module as constructed. Twenty-four Fresnel lenses made of PMMA with an area of 4.5×4.5 cm2 and a focal length of 53mm were used to concentrate the sunlight by a factor of ~ 130 onto the GaAs solar cells. The cells had a diameter of 4mm and used a prismatic cover to reduce the shading losses by the metal fingers of the front grid design. The measured module efficiency was as high as 20.1% under operating conditions in Freiburg [3]. This was a very promising and encouraging result. In the module, single-junction GaAs solar cells with an efficiency of 24% at 100×AM1.5d were used [2]. The cells were manufactured by a fairly simple LPE process using the etchback regrowth technique [4–6]. In order to manufacture high-concentration solar cells, special tools have been developed at Fraunhofer ISE.


Solar Cell Concentrator Module Fresnel Lens Solar Power Plant Tandem Solar Cell 
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© Springer-Verlag Berlin Heidelberg 2007

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