Doping of the metal oxide nanostructure and its influence in organic electronics

Mi Hyae Park, Juo Hao Li, Ankit Kumar, Gang Li, Yang Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

174 Citations (Scopus)


Synthesizing metal oxides through the sol-gel process provides a convenient way for forming a nanostructured layer in wide band gap semiconductors. In this paper, a unique method of introducing dopants into the metal oxide semiconductor is presented. The doped TiO2 is prepared by adding a Cs2CO3 solution to a nanocrystalline TiO2 solution that is synthesized via a non- hydrolytic sol-gel process. The properties of the TiO2:Cs layer are investigated and the results show stable nanostructure morphology. In addition to providing morphological stability, Cs in TiO2 also gives rise to a more desirable work function for charge transport in organic electronics. Polymer solar cells based on the poly(3-hexylthiophene) (P3HT): methanofullerene (PC70BM) system with the addition of a TiO2:Cs interfacial layer exhibit excellent characteristics with a power conversion efficiency of up to 4.2%. The improved device performance is attributed to an improved polymer/metal contact, more efficient electron extraction, and better hole blocking properties. The effectiveness of this unique functionality also extends to polymer light emitting devices, where a lower driving voltage, improved efficiency, and extended lifetime are demonstrated. KGaA, Weinheim.
Original languageEnglish
Pages (from-to)1241-1246
Number of pages6
JournalAdvanced Functional Materials
Issue number8
Publication statusPublished - 23 Apr 2009
Externally publishedYes

ASJC Scopus subject areas

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


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