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A New Concept of Photochemical Upconversion for Thin Film Silicon Solar Cells
B. Fückel, Y.Y. Cheng, R.W. MacQueen, R.G.C.R. Clady, K. Nauta, M.J. Crossley, T.W. Schmidt, C. Johnson, G.J. Conibeer, M.A. Green, K. Lips, B. Stannowski, S. Kirner, T. Hänel, R. Schlatmann, B. Rech, N.J. Ekins-Daukes
Optical Losses, Upconversion, Thin Film Solar Cell
Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
Subtopic: Fundamental Studies
Event: 26th European Photovoltaic Solar Energy Conference and Exhibition
Session: 1BO.9.5
101 - 104
ISBN: 3-936338-27-2
Paper DOI: 10.4229/26thEUPVSEC2011-1BO.9.5
0,00 EUR
Document(s): paper


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 triplettriplet 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 bifacial solar cell. We calculate the relative increase of the photocurrent of the a-Si cell depending on the solar concentrations utilized.