Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 72: Poster Session: Si-based Photovoltaics / Inorganic Photovoltaics / Structure and Transport in Organic Photovoltaics / Organic Semiconductors
HL 72.21: Poster
Mittwoch, 28. März 2012, 16:00–19:00, Poster D
Investigation of recombination processes in organic solar cells using a differential photocurrent method. — •Simon Hein1, Julia Rauh1, and Vladimir Dyakonov1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, D-97074 Würzburg — 2ZAE Bayern, D-97074 Würzburg
To satisfy the world’s need for energy organic solar cells offer, due to their low fabrication costs, a promising alternative. Although power conversion efficiencies of 9.2 % have already been achieved on lab scale [1], the fundamental processes taking place in organic solar cells are still not completely understood. One of the currently most discussed topics is the dominating recombination process of charge carriers, as this loss mechanism influences all of the relevant solar cell parameters. Therefor, a detailed understanding of the recombination mechanisms is essential for further efficiency enhancement. Recently, Koster et al. [2] presented a technique to investigate the influence of light intensity on the charge carrier recombination under short-circuit conditions. Thereby, the differential current density, induced by a modulated light of low intensity superimposed to a continuous background light of various intensities, is measured. We present our data obtained by this technique for poly(3-hexylthiophene) solar cells blended with different electron acceptors. The results are discussed with respect to the charge carrier recombination processes under short-circuit conditions in dependence of temperature and a wide range of light intensities.
[1] R. F. Service, Science, 332, 293 (2011)
[2] L. J. A. Koster et al., Adv. Mater., 23, 1670 (2011)