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

431 Scopus citations

Abstract

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
Volume4
Issue number5
DOIs
StatePublished - May 25 2010

Keywords

  • Doping
  • Graphene
  • Photovoltaic devices
  • Surface analysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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