Dresden 2020 – wissenschaftliches Programm
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HL 76.1: Poster
Donnerstag, 19. März 2020, 15:00–17:30, P2/4OG
Collective effects of polyaromatitc molecules embedded in rare gas matrices — •Moritz Michelbach, Matthias Bohlen, Rupert Michiels, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
Polyaromatic molecules, such as oligoacenens, are promising candidates for organic solar cells. These solar cells can achieve photon-to-current conversion efficiencies beyond the 30% Shockley-Queisser  limit. The underlying process responsible for creating multiple charge carriers from a single photon is called singlet fission. In this process, an excited molecule can partially transfer energy to a neighboring ground-state molecule, and thereby create a correlated triplet pair . To investigate collective processes especially singlet fission, we have measured the lifetime of the excited molecule embedded in rare gas matrices. A significant lifetime reduction is observed in the presence of neighboring molecules . As a comparison to isolated molecules on solid cluster surfaces, we use the artificially bound bis-TIPS pentacene molecule , which is embedded in superfluid helium nanodroplets.
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