Inversion of rectification characteristics modulated by ribbon widths in armchair graphene/h-BN nano-ribbon hetero-junctions with different interface types

摘要

The hetero-junctions composed of armchair graphene and hexagonal boron nitride (graphene/h-BN) hybridized nano-ribbons are constructed, and their current rectification characteristics are investigated by using the density functional theory in combination with the non-equilibrium Green's function method. The calculation results indicate that the hetero-structures with a minor (large) ribbon width appear a novel forward (reverse) rectification behavior, but the rectifying directions are independent of the interface types of graphene/h-BN hybridized nano-ribbons. This interesting width-dependent inverse rectification behavior is further tested by increasing the length in scattering region. The findings in this work demonstrate that graphene/h-BN-based nano-devices with an inversion of rectification behavior can be fabricated by selecting the appropriate nano-ribbon widths.