Charge transfer in thin films of donor-acceptor complexes studied by infrared spectroscopy

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 th...

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Hauptverfasser: Nanova, Diana (VerfasserIn) , Beck, Sebastian (VerfasserIn) , Glaser, Tobias (VerfasserIn) , Pucci, Annemarie (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: July 2012
In: Organic electronics
Year: 2012, Jahrgang: 13, Heft: 7, Pages: 1237-1244
DOI:10.1016/j.orgel.2012.02.021
Online-Zugang:Resolving-System, Volltext: http://dx.doi.org/10.1016/j.orgel.2012.02.021
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S1566119912000924
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Verfasserangaben:Diana Nanova, Sebastian Beck, Andreas Fuchs, Tobias Glaser, Christian Lennartz, Wolfgang Kowalsky, Annemarie Pucci, Michael Kroeger

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520 |a 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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