Goldschmidt, Jan ChristophJan ChristophGoldschmidtAeberhard, U.U.AeberhardCapek, R.R.CapekDebije, M.G.M.G.DebijeEvers, W.W.EversFischer, S.S.FischerFröhlich, B.B.FröhlichHermle, MartinMartinHermleHerter, BarbaraBarbaraHerterIvaturi, A.A.IvaturiKrämer, K.W.K.W.KrämerLifshitz, E.E.LifshitzMartín-Rodríguez, R.R.Martín-RodríguezMacDougall, S.K.W.S.K.W.MacDougallMeijerink, A.A.MeijerinkMoulin, E.A.E.A.MoulinMüller, T.C.M.T.C.M.MüllerPaetzold, U.U.PaetzoldRichards, B.S.B.S.RichardsWolf, S.S.WolfWarzecha, MarekMarekWarzechaWouters, C.C.WoutersZhao, Y.Y.Zhao2022-03-122022-03-122013https://publica.fraunhofer.de/handle/publica/38318010.1364/PV.2013.PT3C.2Advanced systems for harvesting sub-bandgap photons via upconversion were investigated, comprising improved upconverter materials, adapted silicon solar cells, nanocrystalline quantum dots and spectrally selective photonic crystals. Upconversion increased JSC by 13.3±3.0 mA/cm2 at 207±86 suns.enconference paper