Title:	A New Concept of Photochemical Upconversion for Thin Film Silicon Solar Cells
Author(s):	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
Keywords:	Optical Losses, Upconversion, Thin Film Solar Cell
Topic:	Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
Subtopic:	Fundamental Studies
Event:	26th European Photovoltaic Solar Energy Conference and Exhibition
Session:	1BO.9.5
Pages:	101 - 104
ISBN:	3-936338-27-2
Paper DOI:	10.4229/26thEUPVSEC2011-1BO.9.5
Price:	0,00 EUR
Document(s):	paper

Abstract/Summary:

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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.