Table 4 Evaluation of minimum achievable contact resistance. The minimum asymptotic contact resistance achievable for different metals in the situation illustrated in Fig. 7(f) is shown in the last column. We have considered Toff and E Fcont extracted from ab-initio simulations on the medium structure. R Gmin is the ballistic resistance of graphene per unit width for the corresponding E F − E Fcont. The contact asymptotic resistance is obtained as R Gmin/T eff.
Metal | E F − E Fcont (eV) interface | T eff interface | R Gmin (ballistic) (Ω · μm) | Minimum achievable R C (ballistic) (Ω · μm) |
|---|---|---|---|---|
Cu | 0.583 (n-type) | 0.12 | 23.5 | 196 |
Ni | 0.559 (n-type) | 0.69 | 21 | 30 |
Pd | 0.171 (n-type) | 0.11 | 68 | 618 |
Pt | −0.218 (p-type) | 0.47 | 54 | 115 |
