Rostock 2019 – scientific programme

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MO: Fachverband Molekülphysik

MO 21: Coupled Systems

MO 21.1: Invited Talk

Thursday, March 14, 2019, 14:00–14:30, S HS 001 Biologie

Influence of Local and External Electric Fields on the Ultrafast Dynamics of Charge Pairs Photo-Generated in Poly-[3-Hexylthiophene] (P3HT) — Debkumar Rana, Tahirzeb Khan, Patrice Donfack, Vladislav Jovanov, Veit Wagner, and •Arnulf Materny — Jacobs University Bremen, Department of Physics & Earth Sciences, Campus Ring 1, 28759, Bremen, Germany

Organic semiconductors have attracted considerable attention in recent years due to their various advantages. However, both stability and efficiency of organic electronic devices still have to be improved. For this purpose, a detailed understanding of basic processes is of great importance. While the investigation of neat semiconductor material will always be the starting point, in the end, more realistic scenarios have to be considered as well. On this account, we have studied the dynamics of charge-pair states in poly-[3-hexylthiophene] (P3HT), a promising organic semiconductor e.g. for building solar cells, utilizing femtosecond time-resolved transient absorption spectroscopy influenced by internal and external electric fields. Using sub-diffraction-limited microscopy, we were able to detect the dynamics at the interface between P3HT and a gold electrode. Additionally, in P3HT-only diodes, we have applied external fields in reverse and forward bias. In all cases, we found changes in the observed polaron-pair dynamics compared to the neat-P3HT sample without internal and external electric fields. In our presentation, we will give an overview about the experimental techniques applied as well as the interesting results we have obtained.