Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster I
CPP 17.21: Poster
Monday, March 9, 2026, 19:00–21:00, P5
Nanoscale Structural and Electronic Characterization of the DTDCPB:C70 donor-acceptor system for vacuum-deposited organic solar cells — •Milena Merkel1,2, Jan ter Glane1,2, and Harry Mönig1,2 — 1Institute of Physics, University of Münster, Münster, Germany — 2Center for Nanotechnology (CeNTech), Münster, Germany
The active layer of organic solar cells is produced either by solution-processing or vacuum thermal evaporation. While solution-processed cells have achieved higher efficiencies to date, vacuum-deposited cells exhibit higher morphological stability and thus a longer durability. For a future commercialization of organic solar cells, where both efficiency and durability are crucial, understanding the current limitations of vacuum-deposited cells is thus of major interest.
Cells based on an active layer made of the DTDCPB:C70 donor-acceptor system have so far achieved one of the highest efficiencies in the group of vacuum-deposited organic solar cells, while also exhibiting high durability [1,2]. We used a combined approach of high-resolution scanning tunneling microscopy and spectroscopy to investigate the structural and electronic properties of assemblies of these donor and acceptor molecules deposited on single-crystalline substrates, as well as of their lateral and vertical interfaces.
[1] Griffith et al., Phys. Rev. B 92, 085404 (2015)
[2] Zou et al., J. Mater. Chem. A 2, 12397 (2014)
Keywords: Organic solar cells; Donor-acceptor system; Structural characterization; Electronic characterization; Scanning tunneling microscopy