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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster II
CPP 46.27: Poster
Donnerstag, 12. März 2026, 09:30–11:30, P5
Pump-probe spectroscopy on the polyelectrolyte donor polymer PTHS for solar cell applications — •Mick Gindorf1, Anna Köhler1, Christopher Vogt2, and Johannes C. Brendel2 — 1Chair of Soft Matter Optoelectronics, University of Bayreuth — 2Chair of Macromolecular Chemistry I, University of Bayreuth
Poly(3-hexylthiophene) (P3HT) is a well-researched donor polymer for application in organic solar cells (OSCs). Side chain modification of P3HT with sulfonate groups yields PTHS, a polyelectrolytic donor polymer with high hole transport mobility [1]. This polyelectrolyte possesses two key advantages: Firstly, exchange of the cationic counter ions enables insolubilization of the donor layer, allowing simple fabrication of donor-acceptor bilayer systems by sequential spin coating with a wide variety of acceptors, including both fullerene and non-fullerene acceptors (NFAs). Secondly, adjusting the counter ion composition enables tuning of the donor energy level and thereby the donor-acceptor energy level offset (Eoff), which is critical for achieving high open circuit voltages (Voc). These properties make PTHS an ideal model system for the investigation of exciton dissociation in OSCs with spectroscopic techniques, including time-resolved transient absorption spectroscopy. Probing the exciton dissociation dynamics as a function of Eoff on a picosecond timescale in different donor-acceptor systems yields valuable insights into the energetic and entropic contributions that help overcome the exciton binding energy in OSCs.
1) Brendel, J. et al. Chem. Mater. 2014, 26, 6, 1992-1998
Keywords: Organic solar cells (OSCs); Exciton dissociation; Polythiophenes; Non-fullerene acceptors (NFAs); Transient absorption spectroscopy