▎ 摘　　要

The paper focuses on the effect of a multilevel impurity in a graphene nanoribbon on the tunnel current flowing in the contact of the latter with metal. Calculations of the ballistic current in a graphene nanoribbon and the tunnel current of the ribbon contact with metal are performed. Analysis is provided for the dependence of current-voltage characteristic of the contact on the integral of transition between impurity levels of the nanoribbon.