Energy-level alignment at strongly coupled organic-metal interfaces

Meng Ting Chen, Oliver T. Hofmann, Alexander Gerlach, Benjamin Bröker, Christoph Bürker, Jens Niederhausen, Takuya Hosokai, Jörg Zegenhagen, Antje Vollmer, Ralph Rieger, Klaus Müllen, Frank Schreiber, Ingo Salzmann, Norbert Koch, Egbert Zojer, Steffen Duhm

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Energy-level alignment at organic-metal interfaces plays a crucial role for the performance of organic electronic devices. However, reliable models to predict energetics at strongly coupled interfaces are still lacking. We elucidate contact formation of 1,2,5,6,9,10-coronenehexone (COHON) to the (1 1 1)-surfaces of coinage metals by means of ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy, the x-ray standing wave technique, and density functional theory calculations. While for low COHON thicknesses, the work-functions of the systems vary considerably, for thicker organic films Fermi-level pinning leads to identical work functions of 5.2 eV for all COHON-covered metals irrespective of the pristine substrate work function and the interfacial interaction strength.

Original languageEnglish
Article number194002
JournalJournal of Physics Condensed Matter
Volume31
Issue number19
DOIs
Publication statusPublished - 1 Jan 2019

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Keywords

  • density functional theory
  • energy-level alignment
  • Organic-metal interface
  • photoelectron spectroscopy
  • x-ray standing waves

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Fields of Expertise

  • Advanced Materials Science

Cite this

Chen, M. T., Hofmann, O. T., Gerlach, A., Bröker, B., Bürker, C., Niederhausen, J., ... Duhm, S. (2019). Energy-level alignment at strongly coupled organic-metal interfaces. Journal of Physics Condensed Matter, 31(19), [194002]. https://doi.org/10.1088/1361-648X/ab0171