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HL: Fachverband Halbleiterphysik

HL 76: Poster IIIC

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 [1] 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 [2]. 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 [3]. As a comparison to isolated molecules on solid cluster surfaces, we use the artificially bound bis-TIPS pentacene molecule [4], which is embedded in superfluid helium nanodroplets.

[1] W. Shockley and H. J. Queisser, J. Appl. Phys. 32, 510 (1961).

[2] M. B. Smith, J. Michl, Chem. Rev. 110, 6891-6936, (2010).

[3] S. Izadnia et al., J. Phys. Chem. Lett. 8, 2068 (2017).

[4] S. R. Reddy, J. Phys. Chem. Lett., 9, 5979-5986, (2018).