Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 88: Organic Electronics and Photovoltaics V: OPV
HL 88.4: Talk
Friday, March 24, 2017, 11:00–11:15, ZEU 255
Sensitive charge transfer state spectroscopy in organic solar cells — •Martin Streiter1, Stefan Krause2, Alexander Wagenpfahl1, and Carsten Deibel1 — 1Institut für Physik, Technische Universität Chem- nitz, 09126 Chemnitz, Germany — 2Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
The understanding of recombination mechanisms at donor--acceptor interfaces is of high importance for improving organic solar cells as the former determine both photocurrent and open circuit voltage. In order to investigate the influence of interface structure on charge transfer state recombination, we use confocal emission and excitation spectroscopy which we developed and applied to study the reorganisation energy of single molecules [1]. Sensitive measurements of both emission and excitation spectra on the timescale of seconds enable the characterisation of environmental and molecular conformational influences on dynamic spectral properties. Using this technique, we investigate the donor--acceptor charge transfer state in diluted bulk heterojunction systems. We discuss the impact of reorganisation energy and energetic disorder on the charge transfer state distribution in systems directly relevant for organic solar cells.
[1] M. Streiter, S. Krause, C. von Borczyskowski, C. Deibel, J. Phys. Chem. Lett., 7, 4281 (2016).