Dresden 2014 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 61: Organic electronics and photovoltaics III (organized by CPP)
HL 61.1: Talk
Wednesday, April 2, 2014, 09:30–09:45, ZEU 260
Structural Degradation of Polymer Solar Cells — •Christoph J. Schaffer1, Claudia M. Palumbiny1, Martin A. Niedermeier1, Christian Jendrzejewski1, Gonzalo Santoro2, Stephan V. Roth2, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department - LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — 2DESY, Notkestr. 85, 22607 Hamburg
A major challenge in organic photovoltaics (OPV) is to elongate their lifetimes. Several mechanisms of organic solar cell degradation have been proposed in literature within the last years. However, insufficient research has been done on determining the role of transitions in the nanomorphology of the active layer of bulk-heterojunction (BHJ) polymer solar cells as an aspect of degradation. These transitions would strongly affect the properties of solar cells since the active layer morphology plays a crucial role in the energy conversion process.
We present a direct evidence of morphological degradation on a nanometer scale in polymeric solar cells by simultaneous in-situ GISAXS and current-voltage tracking on a running P3HT:PCBM solar cell. The loss of short-circuit current with time is fully modeled by the observed morphological transitions [1].
[1] C. J. Schaffer et al., Adv. Mater. 2013, DOI: 10.1002/adma.201302854