Fückel, B.; Cheng, Y.Y.; MacQueen, R.W.; Tayebjee, M.J.Y.; Clady, R.G.C.R.; Nauta, K.; Crossley, M.J.; Schmidt, T.W.; Johnson, C.; Conibeer, G.J.; Green, M.A.; Lips, K.; Stannowski, B.; Kirner, S.; Hänel, T.; Schlatmann, R.; Rech, B.; Ekins-Daukes, N.J.: A new concept of photochemical upconversion for thin film silicon solar cells. In: Ossenbrink, H. [u.a.] [Eds.] : 26th European Photovoltaic Solar Energy Conference 5 - 9 September, Hamburg, GermanyMünchen: WIP, 2011. - ISBN 3-936338-27-2, p. 101-104
Abstract:
We consider a scheme to increase the conversion efficiency of a single bandgap solar cell by applying photochemical upconversion (UC), i.e. joining two low energy photons together by incoherent means. Photochemical UC makes use of two molecular species; one for absorption of the low energy photons and one for UC via triplet-triplet annihilation as well as emission of the higher energy photons. We describe a model wherein we place a (experimentally fully characterized) UC unit behind a thin a-Si:H bifacial solar cell. We calculate the relative increase of the photocurrent of the a-Si:H cell depending on the solar concentrations utilized.