Understanding Periodic Dislocations in 2D Supramolecular Crystals: The PFP/Ag(111) Interface

E. Goiri, Juan Maria García Lastra, M. Corso, Z. M. Adb El-Fattah, J. E. Ortega, D. G. de Oteyza

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In-plane dislocation networks arise in both inorganic and organic films as a way of relieving the elastic strain that builds up at the substrate interface. In molecule/surface systems, supramolecular interactions are weak and more complex (compared to the atomic bonds in inorganic films), and their interplay with molecule–substrate interactions is very subtle, making it difficult to single out the driving force for a nanoscale dislocation pattern. On the basis of a combined experimental and theoretical work, we here show that periodic dislocations in a molecular PFP film are mainly driven by the optimization of molecule–substrate interactions. Compared to inorganic networks however, it implies a much lower energy imbalance, allowing a thermally induced transition from a low-energy strain dislocation pattern to a high-energy incommensurate moiré.
Original languageEnglish
JournalThe Journal of Physical Chemistry Letters
Volume3
Issue number7
Pages (from-to)848-852
ISSN1948-7185
DOIs
Publication statusPublished - 2012

Keywords

  • epitaxy
  • strain
  • moiré
  • organic
  • template
  • perfluoropentacene

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