Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics III
CPP 37.5: Talk
Wednesday, March 11, 2026, 16:15–16:30, ZEU/LICH
Charge transfer dynamics in PBDB-T blends studied by time-resolved optical spectroscopy — Beatriz Molinaro Guerra1, Federico Cilento2, Maria Luiza Miranda Rocco1, and •Wibke Bronsch2 — 1Institute of Chemistry, Federal University of Rio de Janeiro, 21941-909, Rio de Janeiro-RJ, Brazil — 2Elettra-Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy
Charge transport processes in conjugated polymers are an important key for the production of more efficient organic optoelectronic devices, such as organic solar cells. Specially, the study of electron charge transfer dynamics in excited states may help us to understand charge transport properties in these materials. We studied the ultrafast response of different blends of PBDB-T polymers with small molecules after NIR excitation. Time-resolved optical spectroscopy measurements with broad-band probe pulses performed in the T-ReX facility at Elettra reveal clear changes in the ultrafast response when comparing the results for the pure molecule films and the blends, suggesting that charges are transferred between the two components of the blend on the femto- to picosecond timescale. After exciting the HOMO-LUMO transition of the ITIC molecule, the exciton population decay time drastically reduces due to the presence of the PBDB-T polymer, while the decay constant at photon energies in the range corresponding to the PBDB-T HOMO-1-LUMO transition increases. This behavior indicates hole injections in PBDB-T after primary excitation of ITIC, as it was also discussed for PBBF:ITIC blends [1]. [1] Liu et al. Advanced Science 6, 1802103 (2019).
Keywords: Time-resolved optical spectroscopy; PBDB-T; ITIC; Charge Transfer; Ultrafast dynamics