Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 70: Organic Electronics and Photovoltaics V: OPV (joint session CPP/DS/HL, organized by CPP)

CPP 70.4: Vortrag

Freitag, 24. März 2017, 11:00–11:15, ZEU 255

Sensitive charge transfer state spectroscopy in organic solar cells — •Martin Streiter1, Stefan Krause2, Alexander Wagenpfahl1, and Carsten Deibel11Institut 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).

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