Hole doping of graphene supported on Ir(111) by AlBr3

Abstract

In this Letter we report an easy and tenable way to tune the type of charge carriers in graphene, using a buried layer of AlBr 3 and its derivatives on the graphene/Ir (111) interface. Upon the deposition of AlBr 3 on graphene/Ir(111) and subsequent temperature-assisted intercalation of graphene/Ir(111) with atomic Br and AlBr 3 , pronounced hole doping of graphene is observed. The evolution of the graphene/Br-AlBr 3 /Ir(111) system at different stages of intercalation has been investigated by means of microbeam low-energy electron microscopy/electron diffraction, core-level photoelectron spectroscopy and angle-resolved photoelectron spectroscopy.

Reversible graphene decoupling by NaCl photo-dissociation

“…3 shows that a constant energy cut at E-E f = 1.2 eV of the NaCl/Gr/Ir(111) (Stage 1) system consists of hollow features centered around the K-K´ points, indicating the low doping of the system (Fig.3 left panel, Stage 1). Interestingly, the dispersive π-bands of the sample at Stage 1 are equal to those of a pristine Gr/Ir(111) (Stage 3), slightly p doped (0.1 eV) [28] [29], pointing out the weak interaction of the NaCl film with the graphene.…”

Phonon-mediated superconductivity in doped monolayer materials

“…The first challenge that has to be overcome is therefore doping the system away from the Dirac point. The primary ways of doing this are chemical doping [28][29][30][31][32] and deposition of elements onto (or under) the graphene sheet [33][34][35][36][37][38][39][40][41][42][43]. Using these methods, doping levels approaching the van Hove singularity have been achieved [35].…”

Controlling the growth of epitaxial graphene on metalized diamond (111) surface

“…The p-band of the graphene that has been promoted to the surface intersects with E F near the Dirac point, characteristic of the electron dispersion of pristine graphene. 29 Interactions between graphene layers in FLG films have been shown to result in a change in the electronic dispersion of the p-band close to the Dirac point, 30,31 resulting in a nonlinearity. In our measurements, the electronic dispersion of the p-band near the Dirac point of each graphene layer still exhibits a linear relation, indicating that the interaction between the two layers is weak.…”