The Direct Solution-Process Crystallization of π-Conjugated Small Molecules In-Situ Integrated Planar Electrodes

Lionel Fliegans, Marjorie Morvan, Salah Bensalem, Cyril Calmes, John Anthony, Sébastien Sanaur

Research output: Contribution to journalArticlepeer-review


Organic electronic devices have seen a new enthusiasm in flexible electronics. Indeed, they know new applications and improved performances even fabricated at low temperatures by low-cost solution-process and printing technologies. Nonetheless, some critical aspects remain to be improved, such as organic semiconductor (OSC) patterning and the control and alignment of organic crystal growth in the desired location and direction. Herein, a new controlled OSC solution-growth processing, which directly occurs within planar electrodes patterning, is reported. A capillary-driven flow occurs in air-opened microchannels and then confines the OSC solution before growing these crystals in the desired region and direction. 1) The modeling, 2) fabrication, 3) experimental functionality of such capillary-driven flow techniques, and 4) growth of OSC single-colored crystals in situ integrated planar device electrodes are reported. Polarized optical images show large crystal growth (i.e., >100 μm) of typical π-conjugated small molecules (diF-TES-ADT and C8-BTBT). By such a technology, benefits from both 1) the meniscus-guided coating mechanisms and 2) advantages of maskless and noncontact digital printing technologies are taken. Finally, these results visualize the directional control of OSC single-crystal growth in a printing-compatible (dispensing, inkjet) route in a reliable and reproducible way.

Original languageEnglish
Article number1900617
JournalPhysica Status Solidi (A) Applications and Materials Science
Issue number22
StatePublished - Nov 1 2019

Bibliographical note

Funding Information:
The work was financially supported by the Agence Nationale de la Recherche (grant number ANR-14-CE08-0006). We thank Dr. Cyril Calmes for the realization of the ToC graphics.

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


  • capillary-driven flows
  • flexible and printed electronics
  • organic crystals
  • organic semiconductor patterning

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry


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