Donor-Acceptor Interaction in Films of Tetracene–Tetracyanoquinodimethane Heterostructures and Composites

  • M. P. Gorishnyi Institute of Physics, Nat.Acad.of Sci. of Ukraine (46, Prosp. Nauky, Kyiv 03028, Ukraine)
  • A. B. Verbitsky Institute of Physics, Nat.Acad.of Sci. of Ukraine (46, Prosp. Nauky, Kyiv 03028, Ukraine)
Keywords: donor-acceptor interaction, films, heterostructures, composites, tetracene, tetracyanoquinodimethane, absorption spectrum, photovoltaic response, photo-emf


The structures and the absorption and photovoltaic spectra of thin films of tetracene (TC) and tetracyanoquinodimethane (TCNQ), as well as the films of their heterostructures (TC/TCNQ) and composites (TC + TCNQ), have been studied. The heterostructures and composites are obtained by the thermal sputtering of the components – successively or simultaneously, respectively – in vacuum. The photovoltaic spectra were measured, by using the condenser method. It is found for the first time that the largest changes ΔD1 in the TC/TCNQ and TC + TCNQ absorption spectra with respect to the sum of the absorption spectra of the components are observed in the intervals of TCNQ dimeric bands at 2.214 eV (ΔD1 < 0) and in all TC bands (ΔD1 > 0). Those changes testify to the formation of charge transfer complexes between the TC (the electron donor) and TCNQ (the electron acceptor) molecules at the interfaces in the TC/TCNQ heterostructures and in the bulk of TC + TCNQ composites, which is also confirmed by the appearance of TC+- and TCNQ-bands in the photovoltaic spectra of both the heterostructure and composite films. This result is important for a deeper understanding of the operating mechanisms in various potentially imaginable devices based on those heterostructures and composites (solar cells, field-effect transistors, and light-emitting diodes).


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How to Cite
Gorishnyi, M., & Verbitsky, A. (2018). Donor-Acceptor Interaction in Films of Tetracene–Tetracyanoquinodimethane Heterostructures and Composites. Ukrainian Journal of Physics, 63(1), 70-80.
Surface physics