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

• Verfasst von: Nanova, Diana [VerfasserIn]
• Verfasst von: Beck, Sebastian [VerfasserIn]
• Verfasst von: Glaser, Tobias [VerfasserIn]
• Verfasst von: Pucci, Annemarie [VerfasserIn]
• Titel: Charge transfer in thin films of donor-acceptor complexes studied by infrared spectroscopy
• Verf.angabe: Diana Nanova, Sebastian Beck, Andreas Fuchs, Tobias Glaser, Christian Lennartz, Wolfgang Kowalsky, Annemarie Pucci, Michael Kroeger
• E-Jahr: 2012
• Jahr: July 2012
• Umfang: 8 S.
• Fussnoten: Gesehen am 30.10.2018
• Titel Quelle: Enthalten in: Organic electronics
• Ort Quelle: Amsterdam [u.a.] : Elsevier Science, 2000
• Jahr Quelle: 2012
• Band/Heft Quelle: 13(2012), 7, Seite 1237-1244
• DOI: doi:10.1016/j.orgel.2012.02.021
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Charge transfer complexes
• Sach-SW: Density functional theory
• Sach-SW: IR-spectroscopy
• Sach-SW: TCNQ
• Sach-SW: Thin films
• K10plus-PPN: 1582436681

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.