NiOX/MoO3 Bi-layers as efficient hole extraction contacts in organic solar cells

Philip Schulz, Sarah R. Cowan, Ze Lei Guan, Andres Garcia, Dana C. Olson, Antoine Kahn

Research output: Contribution to journalArticlepeer-review

66 Scopus citations


The electronic structure of a bi-layer hole extraction contact consisting of nickel oxide (NiOx) and molybdenum trioxide (MoO3) is determined via ultraviolet and X-ray photoemission spectroscopy. The bi-layer presents ideal energetics for the extraction of holes and suppression of carrier recombination at the interface. The application of the NiOx/MoO 3 bi-layer as the anode of organic bulk heterojunction solar cells based on PCDTBT/PC71BM leads to improved device performance, which is explained by an intricate charge transfer process across the interface. Nickel oxide/molybdenum oxide bi-layers enhance hole collection in organic photovoltaic devices. Device improvement in PCDTBT:PC71BM based solar cells is attributed to the electronic structure of the oxide interlayer. The electron blocking capability of NiOx is combined with the high work function of MoO3, which enable efficient coupling of the electrode to the hole transport level in the polymer.

Original languageEnglish (US)
Pages (from-to)701-706
Number of pages6
JournalAdvanced Functional Materials
Issue number5
StatePublished - Feb 5 2014

All Science Journal Classification (ASJC) codes

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


  • charge transport
  • electronic structure
  • organic electronics
  • photovoltaic devices


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