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Determining the internal quantum efficiency of highly efficient polymer solar cells through optical modeling
Slooff, L.H.; Veenstra, S.C.; Kroon, J.M.; Moet, D.J.D.; Sweelssen, J.; Koetse, M.M.
Published by: Publication date:
ECN Solar Energy 3-4-2007
ECN report number: Document type:
ECN-W--07-004 Article (scientific)
Number of pages:

Published in: Applied Physics Letters (American Institute of Physics), , 2007, Vol.90, 143506, p.-.

A power conversion efficiency of 4.2% (AM1.5, 1000 W/M2) is measured for an organic solar cell based on an active layer of an alternating copolymer, containing a fluorence and a benzothadiazole unit with two neighboring thiophene rings, and a fullerene derivative. Using optical modeling, the absorption profile in the active layer of the solar cell is calculated and used to calculate the maximum short circuit current. The calculated currents are compared with measured currents from current-voltage measurements for various film thicknesses. From this the internal quantum efficiency is estimated to be 75% at the maximum for the best device.

Copyright (2007) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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