AI Article Synopsis
- The research focuses on the work function of graphene under different metal electrodes, which is essential for improving graphene-based electronic devices.
- The study measures the work function values for the first time using the C-V characteristics of a metal-graphene-oxide-semiconductor capacitor.
- Results show that the work function varies with the type of metal used, with Cr/Au or Ni contact matching the metal's work function, while Pd or Au contact tend to keep it around 4.62 eV, offering lower contact resistance.
Article Abstract
Although the work function of graphene under a given metal electrode is critical information for the realization of high-performance graphene-based electronic devices, relatively little relevant research has been carried out to date. In this work, the work function values of graphene under various metals are accurately measured for the first time through a detailed analysis of the capacitance-voltage (C-V) characteristics of a metal-graphene-oxide-semiconductor (MGOS) capacitor structure. In contrast to the high work function of exposed graphene of 4.89-5.16 eV, the work function of graphene under a metal electrode varies depending on the metal species. With a Cr/Au or Ni contact, the work function of graphene is pinned to that of the contacted metal, whereas with a Pd or Au contact the work function assumes a value of ∼4.62 eV regardless of the work function of the contact metal. A study of the gate voltage dependence on the contact resistance shows that the latter case provides lower contact resistance.
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