Dresden 2011 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 40: Organic Electronics and Photovoltaics HL-II (jointly with CPP, HL, and O)

DS 40.2: Vortrag

Mittwoch, 16. März 2011, 10:30–10:45, FOE Anorg

Investigation of Charge Transfer States in MDMO-PPV:PCBM Solar Cells — •Julia Kern¹, Sebastian Schwab¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Faculty of Physics and Astronomy, Julius-Maximilians-University of Würzburg, Am Hubland, D- 97074 Würzburg — ²Center for Applied Energy Research (ZAE Bayern e. V.), Am Hubland, D-97074 Würzburg

In recent years, so called charge transfer states (CTS), i.e. interfacial states generated at the donor-acceptor heterojunction in organic solar cells, have attracted a considerable amount of attention and their role in the processes of charge carrier dissociation and recombination has been discussed controversially. In this context, we investigated the photo- (PL) and electroluminescence (EL) originating from blends of MDMO-PPV and various fullerene derivatives. Upon blending donor and acceptor, a peak emerges at the lower energetic side of the pure material excitonic transitions which can be attributed to a CTS. Interestingly, a distinct red shift of this CTS emission is observed between the obtained EL and PL spectra. Furthermore, we studied the influence of temperature and voltage variations on the intensity and spectral shape of the CTS emission.