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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Poster Session I - Molecular Electronics and Wetting

CPP 6.2: Poster

Monday, March 22, 2021, 16:30–18:30, CPPp

Ordered donor-acceptor complex formation and electron transfer in co-deposited films of structurally dissimilar molecules — •Andreas Opitz¹, C. Peter¹, B. Wegner^1,2, H.S.S.R. Matte¹, A. Röttger¹, T. Florian¹, X. Xu¹, P. Beyer¹, L. Grubert¹, S. Hecht¹, V. Belova³, A. Hinderhofer³, F. Schreiber³, C. Kapser⁴, J. Pflaum⁴, Y. Zhang⁵, S. Barlow⁵, S.R. Marder⁵, and N. Koch^1,2 — ¹Humboldt-Universität zu Berlin — ²Helmholtz-Zentrum Berlin für Materialien und Energie — ³Universität Tübingen — ⁴Universität Würzburg — ⁵Georgia Institute of Technology Atlanta (USA)

Electrical and optoelectronic properties of organic semiconductor thin films can be tailored by co-deposition of molecular materials. At the moment it is difficult to predict a priori the resulting morphology (like phase separation or mixed crystals) for a selected material combination. Here, we study electron transfer between planar, rod-like electron donor molecules (DIP, PEN, DBTTF) and a non-planar electron acceptor molecule [Mo(tfd)₃] in co-evaporated films by analyzing morphological, vibrational and optical properties. [1]

The resulting morphology of the co-deposited films (phase separation or mixed crystals) can be rationalized within the laws of thermodynamics. Therefore, it is necessary to consider structural incompatibility of the molecules in terms of interaction energies between the molecules as well as the Coulomb attraction between molecular ions after the formation via ground-state electron transfer.

[1] A. Opitz et al., J. Phys. Chem. C 124 (2020) 11023-11031.