Intensity dependent but temperature independent charge carrier generation in organic photodiodes and solar cells |
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Authors: | Nico Christ Siegfried W Kettlitz Sebastian Valouch Jan Mescher Mirco Nintz Uli Lemmer |
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Affiliation: | Light Technology Institute (LTI) and Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), Engesser Straße 13, D-76131 Karlsruhe, Germany |
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Abstract: | Measurements of the transient photoresponse of organic photodiodes and solar cells show a strong saturation effect in the quantum efficiency at laser fluences above approximately 3.3 μJ/cm2. By a comparison of the measured intensity, temperature and field dependence of the transient pulse responses with extended drift–diffusion simulations, the loss of charge carriers can be traced back to a quadratic loss channel in the charge carrier generation process. In contrast to the predictions of the commonly used Onsager–Braun charge carrier generation model, we demonstrate that the dissociation of bound electron–hole-pairs is temperature independent but slightly field dependent. |
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