Optimization solutions for photovoltaic modules with Fresnel lenses and 3-5-junction solar cells
Shvarts M.Z. 1, Emelyanov V.M. 1, Levina S.A. 1, Nakhimovich M.V. 1, Soluyanov A.A.1
1Ioffe Institute, St. Petersburg, Russia
Email: shvarts@scell.ioffe.ru, vm.emelyanov@mail.ioffe.ru, levina@mail.ioffe.ru, nmar@mail.ioffe.ru, vinivka442@yandex.ru

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The paper discusses the advantages of using five junction solar cells (compared with three-junction cells with similar efficiency values) in concentrator photovoltaic modules with Fresnel lenses. It has been shown that the five-junction solar cells applying make it possible to reduce the focal length of the Fresnel lens and the design height of the module by ~ 15%, and to gain in material consumption and weight respectively. An additional advantage of short–focus lenses is the preservation of high optical efficiency at misorientation angles up to 1o with a geometric concentration of 100X preset for the "lens-solar cell" pair. This makes it possible to predict an increased average energy output of concentration photovoltaic modules as part of a tracking photovoltaic installation under outdoor operating conditions. Keywords: Fresnel lens, multijunction solar cell, average geometrical sunlight concentration, misorientation angle.
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