Molecular n-type doping of 1,4,5,8-naphthalene tetracarboxylic dianhydride by pyronin B studied using direct and inverse photoelectron spectroscopies

Calvin K. Chan, Eung Gun Kim, Jean Luc Brédas, Antoine Kahn

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112 Scopus citations

Abstract

Molecular n-type doping of 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTCDA) by pyronin B (PyB) is investigated using ultraviolet photoelectron spectroscopy (UPS), inverse photoelectron spectroscopy (IPES), and current-voltage (I-V) measurements. Deposition of small amounts (< 2 Å) of PyB on pristine NTCDA films leads to a shift of all the molecular levels away from the Fermi level by nearly 0.20 eV, indicative of n-type doping of NTCDA by PyB. Interface and bulk energy levels of films formed by co-evaporation of host and dopant show similarly efficient n-doping. The spectroscopic measurements are confirmed by I-V measurements, which show a four-orders-of-magnitude increase in current in doped films. The comparison of data obtained from UPS of the neat PyB film with the results of density functional theory calculations confirm that two species of PyB are evaporated and condensed into the solid state, with one species primarily responsible for doping.

Original languageEnglish (US)
Pages (from-to)831-837
Number of pages7
JournalAdvanced Functional Materials
Volume16
Issue number6
DOIs
StatePublished - Apr 4 2006

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

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