Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 48: Nanoparticles and Composite Materials II

CPP 48.4: Vortrag

Freitag, 18. März 2011, 11:15–11:30, ZEU 114

Light induced electron spin resonance studies on films for hybrid solar cells — •Florian Witt, Marta Kruszynska, Irina Lokteva, Nikolay Radychev, Joanna Kolny-Olesiak, Holger Borchert, and Jürgen Parisi — University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory (EHF), 26111 Oldenburg, Germany

Light induced electron spin resonance spectroscopy (l-ESR) is a widely used tool for the investigation of long living charges in conjugated polymers as well as in blends for organic and hybrid photovoltaics. Latter one is a synonym for solar cells out of a blend of colloidally prepared, inorganic nanocrystals and an organic conjugated polymer which act as a donor/acceptor system. With l-ESR two limiting factors in hybrid blends were investigated. At first we show the influence of traps related to unpassivated surface states on the charge carrier recombination. These states occur due to the necessary ligand exchange of the nanoparticles (A thick ligand shell resulting from colloidal synthesis needs to be replaced by smaller molecules such as pyridine to enable charge transfer). The influence of the ligand exchange treatment on the charge carrier recombination will be shown. A second focus lies on so called charge transfer complexes (CTC) in hybrid blends. These states consist of a bound polaron pair at the donor acceptor interface. We show their occurance by l-ESR.