Bistetracene Thin Film Polymorphic Control to Unravel the Effect of Molecular Packing on Charge Transport

Edmund K. Burnett, Jack Ly, Muhammad R. Niazi, Lei Zhang, Samantha R. McCuskey, Aram Amassian, Detlef M. Smilgies, Stefan C.B. Mannsfeld, Alejandro L. Briseno*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Polymorphism, the ability for a given material to adopt multiple crystalline packing states, is a powerful approach for investigating how changes in molecular packing influence charge transport within organic semiconductors. In this study, a new “thin film” polymorph of the high-performance, p-type small molecule N-octyldiisopropylsilyl acetylene bistetracene (BT) is isolated and characterized. Structural changes in the BT films are monitored using static and in situ grazing-incidence X-ray diffraction. The diffraction data, combined with simulation and crystallographic refinement calculations, show the molecular packing of the “thin film” polymorph transforms from a slipped 1D π-stacking motif to a highly oriented and crystalline film upon solvent vapor annealing with a 2D brick-layer π-stacking arrangement, similar to the so-called “bulk” structure observed in single crystals. Charge transport is characterized as a function of vapor annealing, grain orientation, and temperature. Demonstrating that mobility increases by three orders of magnitude upon solvent vapor annealing and displays a differing temperature-dependent mobility behavior.

Original languageEnglish (US)
Article number1701607
JournalAdvanced Materials Interfaces
Issue number9
StatePublished - May 9 2018

Bibliographical note

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


  • bistetracene
  • organic semiconductors
  • polymorphism
  • solvent vapor annealing

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering


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