Regensburg 2025 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 15: Poster Session I
CPP 15.49: Poster
Monday, March 17, 2025, 19:00–21:00, P4
Modifying spacers for higher efficiency and stability of single-component organic solar cells — •Yakun He1, Peter Baeuerle2, Weiwei Li3, Christoph Brabec4, and Frederic Laquai1,5 — 1King Abdullah University of Science and Technology, Saudi Arabia — 2University of Ulm, Germany — 3Beijing University of Chemical Technology, China — 4Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany — 5Ludwig-Maximilians-Universität München, Munich, Germany.
Organic solar cells have achieved 20% efficiencies yet still lag regarding stability. Single-component materials incorporating donor and acceptor moieties in a nonconjugated method exhibit intrinsically high stability because of the restriction of morphological evolution. Nevertheless, the efficiency of single-component organic solar cells (SCOSCs) is still low compared to bulk heterojunction structures. We employ a series of dyads with similar structures but modify their spacer type and lengths to investigate the structure-morphology-performance relation. Photophysics has been studied by using steady-state and transient absorption and photoluminescence. Dyad4, with a proper long spacer, has shown the highest efficiency and surprisingly high stability under illumination. Moreover, we investigated the thermal stability of double-cable polymers by tuning the linker length between donor and acceptor moieties. Surprisingly, double-cable polymers do not show a decline of stability with the increase of space linker, and all of them display remarkably excellent stability without degradation after heating for 1000 hours at 90 degree.
Keywords: single-component organic solar cells; dyad; double-cable polymer; stability; space linker