Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Organic Electronics and Photovoltaics III - Organic Photovoltaics
CPP 50.6: Vortrag
Donnerstag, 4. April 2019, 10:45–11:00, H18
Microscopic effects of the broadening of the density of states in donor-acceptor blends and their role in organic photovoltaics — •Michel Panhans1, Sebastian Hutsch1, Johannes Bednuhn2, Karl Sebastian Schellhammer1, Koen Vandewal3, and Frank Ortmann1 — 1Center for Advancing Elec- tronics Dresden, TU Dresden — 2Institut für Angewandte Physik, TU Dresden — 3Institute for Materials Research (IMO-IMOMEC), Hasselt University, Wetenschapspark 1, 3590 Diepenbeek, Belgium
Microscopic understanding and quantifying the density of states including linewidth broadening and dissipation mechanisms in organic semiconductors [1,2] plays a crucial role for designing efficient solar cells and transistors. We study models of fullerene based donor-acceptor systems regarding their response to optical excitations. We analyze the density of states (DOS) and excited-state DOS with electronic disorder and electron-phonon interaction based on ab initio simulations. The calculated temperature dependence of the absorption linewidth is compared to temperature dependent absorption measurements on the same blends where we find very good agreement. Finally, we discuss implications for the open-circuit voltage in organic solar cells.
[1] D. Venkateshvaran et al. Nature 515, 384 (2014).
[2] K. Vandewal et al. J. Am. Chem. Soc. 139, 1699 (2017).