Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Poster: Organic Semiconductors

CPP 32.3: Poster

Wednesday, March 13, 2013, 16:30–18:30, Poster C

Charge generation and loss processes in polymer-polymer solar cells — •Hannah Mangold¹, Ian A. Howard¹, Marcel Schubert², Dieter Neher², and Frédéric Laquai¹ — ¹Max Planck Institute for Polymer Research, Mainz, Germany — ²Institute of Physics, University of Potsdam, Germany

All-polymer solar cells, where both donor and acceptor component are π-conjugated polymers, have the advantage of a broad absorption over the entire visible wavelength range. In this contribution we use broadband visible and near-infrared transient absorption spectroscopy covering the picosecond to microsecond timescale to investigate the charge generation and loss processes in various blends of the well-known donor polymer P3HT with a naphthalenediimde(NDI)-based copolymer exhibiting maximum power conversion efficiencies up to 1.4%. We demonstrate that the anticorrelation between the NDI-aggregation and solar cell performance recently reported by us [1] is caused by a variation of the fraction of contact sites between the donor and acceptor polymer that can facilitate free charge generation and that this fraction is strongly influenced by the choice of solvents used for film preparation. [1] Schubert et al, Adv. Energy Mat. 2012, 2, 369.