Journal
APPLIED PHYSICS LETTERS
Volume 91, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2736280
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Photovoltaic devices from the low-band-gap alternating copolymer APFO-Green1, blended with the fullerene derivative BTPF70 as electron acceptor, show a pronounced variation of the external quantum efficiency with varying thickness. Device simulation, based on ellipsometric characterization, reveals that this behavior is to be expected and valid also for most low-band-gap polymers and that it can be explained by optical interference. Requirements for materials suitable for wide spectral coverage in thin-film organic solar cells are delineated. Furthermore, the internal quantum efficiency is calculated to be approximate to 0.4. (C) 2007 American Institute of Physics.
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