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Multifunctional molecular charge-transfer thin films.

Beibei Xu1, Zheng Li, Shuquan Chang

  • 1Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA. shenren@buffalo.edu.

Nanoscale
|November 21, 2019
PubMed
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Researchers engineered organic charge transfer thin films with bis(ethylenedithio)tetrathiafulvalene and C60. This resulted in broad-band absorption and tunable photoresponse, offering a new method for multifunctional materials.

Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Organic charge transfer (CT) complexes are crucial for electronic and optoelectronic applications.
  • Controlling interfacial interactions in thin films is key to tailoring material properties.
  • Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) and C60 are well-established components in organic electronics.

Purpose of the Study:

  • To investigate controlled interfacial interactions in crystallized organic CT thin films.
  • To explore the impact of these interactions on optical and electronic properties.
  • To achieve multifunctional molecular crystallized thin films with enhanced stimuli response.

Main Methods:

  • Fabrication of crystallized organic thin films using BEDT-TTF and C60.

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  • Characterization of interfacial charge transfer interactions.
  • Measurement of broad-band absorption spectra (UV to near-infrared).
  • Evaluation of wavelength-dependent ambipolar photoresponse.
  • Assessment of multi-stimuli responsive behavior and conductivity enhancement through coupling with tetrathiafulvalene-(7,7,8,8-tetracyanoquinodimethane) (TTF-TCNQ) CT complex.

    • Main Results:

    • Achieved controlled interfacial charge transfer interactions in BEDT-TTF:C60 thin films.
    • Induced broad-band absorption spanning the UV to near-infrared regions.
    • Demonstrated wavelength-dependent ambipolar photoresponse (negative/positive).
    • Exhibited multi-stimuli responsive behavior attributed to CT interactions.
    • Significantly increased conductivity by coupling with TTF-TCNQ CT complex.

    Conclusions:

    • Controlled interfacial charge transfer is an effective strategy for developing multifunctional organic crystallized thin films.
    • The engineered films exhibit superior response to external stimuli.
    • This approach opens avenues for advanced organic electronic and optoelectronic devices.