Charge transfer in thin films of donor–acceptor complexes studied by infrared spectroscopy |
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Authors: | Diana Nanova Sebastian Beck Andreas Fuchs Tobias Glaser Christian Lennartz Wolfgang Kowalsky Annemarie Pucci Michael Kroeger |
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Affiliation: | 1. TU Braunschweig, Institute for High-Frequency Technology, Schleinitzstr. 22, 38106 Braunschweig, Germany;2. U Heidelberg, Kirchhoff-Institute for Physics, INF 227, 69120 Heidelberg, Germany;3. BASF SE, 67056 Ludwigshafen, Germany;4. InnovationLab GmbH, Speyerer Str. 4, 69115 Heidelberg, Germany |
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Abstract: | The degree of charge transfer in thin films of organic charge transfer (CT)-complexes, which are deposited via thermal evaporation, is examined via infrared-spectroscopy. We demonstrate a linear relationship between the shift in the excitation energy of the CN-stretching mode of CT-complexes with the acceptor 7,7,8,8-tetracyanoquinodimethane (TCNQ) and the charge transfer. The measured correlation corresponds very well with DFT calculations. For Na-TCNQ we observe a splitting in the peak of the CN-stretching mode, which can be explained by the coupling of two modes and was confirmed by the calculations. In CT-complexes with partial charge transfer the appearance of an electronic excitation is demonstrated. |
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