SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Organic Electronics and Photovoltaics II (joint session CPP/HL)
CPP 36.1: Vortrag
Mittwoch, 29. März 2023, 15:00–15:15, GÖR 226
Charge-carrier dynamics across seven orders of magnitude in double-cable polymer-based single-component organic solar cells — •Yakun He1,2, Bingzhe Wang1, Larry Lueer1, Dirk Guldi1, Ning Li1, and Christoph Brabec1 — 1Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstrasse 7, 91058 Erlangen, Germany — 2KAUST Solar Center, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
Single-component organic solar cells (SCOSCs) with intrinsically high stability have witnessed efficiencies from 2-3% to 6-11%. For boosting higher efficiencies of SCOSCs, essential information of charge-carrier dynamics as a function of microstructure is highly demanded, requesting systematical investigation on photophysics. In this work, for the first time, the charge-carrier dynamics of a representative double-cable polymer, which achieves efficiencies of over 6% as an active layer in SCOSCs, is investigated across seven orders of magnitude in time scale, from fs-ps TAS and ps-ns TRPL for probing charge generation to ns-us TAS for charge recombination. Specific emphasis is placed on understanding the impact of thermal post-treatment on the charge dissociation, transport, and recombination dynamics. By increasing the thermal annealing temperature, geminate recombination is reduced accompanied by more efficient charge dissociation and suppressed bimolecular recombination. Annealing the photoactive layer at 230 oC results in the highest photovoltaic performance correlating well with the findings from transient studies. This work intends to present a complete picture of the charge-carrier dynamics in SCOSCs.