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DS: Fachverband Dünne Schichten
DS 42: Organic Electronics and Photovoltaics II
(Joint session of CPP, DS, HL and O, organized by CPP)
DS 42.2: Vortrag
Donnerstag, 10. März 2016, 10:00–10:15, H40
A new Figure of Merit for Organic Solar Cells with Transport-limited Photocurrents — •Dieter Neher1, Juliane Kniepert1, Arik Elimelech1, and L. Jan Anton Koster2 — 1University of Potsdam, Potsdam, Germany — 2Zernike Institute for Advanced Materials, Groningen, The Netherlands
Organic semiconductors exhibit superior absorption properties but suffer from low mobilities. Organic solar cells, therefore, display non-ideal JV-curves. Here, we present a closed-form analytical expression for the JV-curves of organic solar cells, based on the model in reference [1]. The expression is able to reproduce simulated JV-curves for a wide range of mobilities, generation rates and recombination parameters. Most importantly, the model delivers a novel figure of merit α to express the balance between free charge recombination and extraction in low mobility photoactive materials. This figure of merit is shown to determine critical device parameters such as the apparent series resistance and the fill factor. We also find α to be related to the parameter θ as defined in reference [2], showing that the approaches published in [1] and [2] are closely related. With that, we can accurately reproduce the gradual decrease of the fill factor with increasing recombination coefficient, decreasing mobility and increasing thickness.
U. Würfel, D. Neher, A. Spies, S. Albrecht, Nat Commun 2015, 6, 6951
[2] D. Bartesaghi et al., Nat Commun 2015, 6, 7083