Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 36: Poster: Nanoparticles and Composite Materials

CPP 36.19: Poster

Wednesday, March 16, 2011, 17:00–19:00, P2

Photoinduced Charge Transfer in Blends of PbSe Nanocrystals and Poly(3-hexylthiophene) — •Elena Selishcheva, Florian Witt, Niklas Trautwein, Holger Borchert, Jürgen Parisi, and Joanna Kolny-Olesiak — University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory (EHF), 26111 Oldenburg, Germany

Colloidal, infrared-absorbing lead selenide nanocrystals (PbSe NC) are one of the promising candidates for application as a photoactive component in hybrid solar cells due to their ability to absorb light over a large energy range of the solar spectrum. The nanoparticles blended with a conjugated polymer, such as poly(3-hexylthiophene) (P3HT), are a donor/acceptor system, which can promote efficient charge transfer. The charge separation between donor and acceptor can be studied by electron paramagnetic resonance (EPR), which detects the unpaired spin of polarons, and by photoinduced absorption spectroscopy (PIA), which monitors the change in the transmission of a nanoparticles/polymer blend due to polaronic transitions.

In this work we present a novel synthesis of oleic acid capped PbSe NC. Prior to mixing with the polymer these particles were treated with hexylamine, because its shorter hydrocarbon chain (compared to oleic acid) is supposed to improve the charge transfer in blends PbSe NC/P3HT. The charge separation was studied by EPR and PIA. These measurements suggest that charges are produced by photoinduced charge transfer. The blends PbSe NC/P3HT were used to prepare first laboratory solar cells.