Molecular-scale properties of MoO3 -doped pentacene

Sieu D. Ha, Jens Meyer, Antoine Kahn

Research output: Contribution to journalArticle

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Abstract

The mechanisms of molecular doping in organic electronic materials are explored through investigation of pentacene p -doped with molybdenum trioxide (MoO3). Doping is confirmed with ultraviolet photoelectron spectroscopy. Isolated dopants are imaged at the molecular scale using scanning tunneling microscopy (STM) and effects due to localized holes are observed. The results demonstrate that donated charges are localized by the counterpotential of ionized dopants in MoO3 -doped pentacene, generalizing similar effects previously observed for pentacene doped with tetrafluoro- tetracyanoquinodimethane. Such localized hole effects are only observed for low molecular weight MoO3 species. It is shown that for larger MoO 3 polymers and clusters, the ionized dopant potential is sufficiently large as to mask the effect of the localized hole in STM images. Current-voltage measurements recorded using scanning tunneling spectroscopy reveal that electron conductivity decreases in MoO3 -doped films, as expected for electron capture and p -doping.

Original languageEnglish (US)
Article number155434
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number15
DOIs
StatePublished - Oct 18 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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