Regensburg 2016 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 74: Transport: Molecular Electronics and Photonics 1 (Joint session of CPP, DS, HL, MA, O and TT, organized by TT)
HL 74.5: Talk
Thursday, March 10, 2016, 10:30–10:45, H23
Investigation of charge transfer processes in single crystals based on π-conjugated molecules — •Antonia Morherr1, Alisa Chernenkaya2, Sebastian Witt1, Katerina Medjanik3, Michael Bolte1, Martin Baumgarten4, Harald O. Jeschke1, Roser Valentí1, and Cornelius Krellner1 — 1Goethe-Universität Frankfurt, 60438 Frankfurt a. M., Germany — 2Johannes Gutenberg-Universität, 55099 Mainz, Germany — 3Lund University, MAX-lab, 22100 Lund, Sweden — 4MPI für Polymerforschung, 55021 Mainz, Germany
Designing new charge transfer (CT) materials for tuning the physical properties ranging from metallicity over superconductivity to Mott insulators and the understanding of mechanisms of CT is of great interest [1]. New CT crystals of π-conjugated molecules as donors can be obtained by physical vapor transport (PVT) [2]. (Fluorinated) tetracyanoquinodimethane (TCNQ-Fx, x=0, 2, 4) was used as acceptor material to grow different CT salts. The crystal structure was detected by X-ray diffraction. Further spectroscopic measurements as infrared and NEXAFS measurements were applied on these single crystals to investigate the CT process. The analysis of N1s and F1s K-edge spectra shows changes for different acceptor strengths. Ab initio calculations for all compounds underline these results. This systematic investigation of CT materials helps to understand the CT process in more detail.
[1] N. Toyota, M. Lang, J. Müller, Low-Dimensional Molecular Metals,
Springer-Verlag, Berlin, 2007
[2] B. Mahns et al., Cryst. Growth Des. 14, 1338 (2014)