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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 25: Molecular Electronics and Excited State Properties II
CPP 25.6: Talk
Wednesday, March 20, 2024, 10:45–11:00, H 0111
Thiophene-based Polymers in Time Resolved Photoelectron Spectroscopy — •Tobias Reiker1, Marek K. Charyton2, Kamil Kotwica2, Zitong Liu3, Deqing Zhang3, Nicolas D. Boscher2, and Helmut Zacharias1 — 1Center for Soft Nanoscience, University of Münster, Germany — 2Materials Research and Technology Department, Luxembourg Institute of Science and Technology, Esch-sur-Alzette, Luxembourg — 3Institute of Chemistry, Chinese Academy of Science, Beijing, China
Thiophene-based polymers are promising candidates for solar cell, OLED or transistor (OFET) applications. An internal donor (D) - acceptor (A) system is formed by coupling thiophene polymers with pyrrole chains. The charge transport behavior can be tuned by different alkyl side chains since they influence the electronic structure, HOMO and LUMO level positions, and interchain interactions. With diketopyrrolopyrrole - thiophene (TDPP), diketopyrrolopyrrole - quaterthiophene (PDPP4T) and thienyl-diketopyrrolopyrrole-thieno-thiophene (PDPPTTT) we investigated the electronic dynamics of verified high hole-mobility organic semiconductors. We report results of temporally resolved photoemission studies of thiophene polymers on Silicon substrates. Occupied electronic levels were analysed via static UPS. Dynamic 2PPE experiments were performed for the energetic position and dynamics of the unoccupied states. The systems were studied as deposited by spin coating as well as by oCVD with and without sidechains.
Keywords: tr-2ppe; Photoelectron spectroscopy; time resolved; ulta-fast