1307.0690 (Ryota Ifuku et al.)

The density of states of graphene underneath a metal electrode and its
correlation with the contact resistivity    [PDF]

Ryota Ifuku, Kosuke Nagashio, Tomonori Nishimura, Akira Toriumi

The density of states (DOS) of graphene underneath a metal is estimated through a quantum capacitance measurement of the metal/graphene/SiO2/n+-Si contact structure fabricated by a resist-free metal deposition process. Graphene underneath Au maintains a linear DOS - energy relationship except near the Dirac point, whereas the DOS of graphene underneath Ni is broken and largely enhanced around the Dirac point, resulting in only a slight modulation of the Fermi energy. Moreover, the DOS of graphene in the contact structure is correlated with the contact resistivity measured using devices fabricated by the resist-free process.

View original: http://arxiv.org/abs/1307.0690