Work function engineering of graphene electrode via chemical doping

Yumeng Shi, Ki Kang Kim, Alfonso Reina, Mario Hofmann, Lain Jong Li*, Jing Kong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

507 Scopus citations


In this work, we demonstrate that graphene films synthesized by chemical vapor deposition (CVD) method can be used as thin transparent electrodes with tunable work function. By immersing the CVD-grown graphene films into AuCl 3 solution, Au particles were formed on the surface of graphene films by spontaneous reduction of metal ions. The surface potential of graphene films can be adjusted (by up to ∼ 0.5 eV) by controlling the immersion time. Photovoltaic devices based on n-type silicon interfacing with graphene films were fabricated to demonstrate the benefit of an electrode with tunable work function. The maximum power conversion efficiency (PCE) achieved was ∼ 0.08%, which is more than 40 times larger than the devices without chemical doping.

Original languageEnglish (US)
Pages (from-to)2689-2694
Number of pages6
JournalACS Nano
Issue number5
StatePublished - May 25 2010
Externally publishedYes


  • Doping
  • Graphene
  • Photovoltaic devices
  • Surface analysis

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


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