石墨烯/h-BN异质结中带宽调制的反转整流特性

Inversion of Rectification Characteristics Modulated by Ribbon Widths in Armchair Graphene/h-BN Nano-ribbon Hetero-junctions with Different Interface Types

构建了由扶手椅型石墨烯和六方氮化硼(石墨烯/h-BN)杂化纳米带组成的异质结,利用密度泛函理论结合非平衡格林函数方法研究了异质结的电流整流特性。计算结果表明,具有较小(大)带宽的异质结出现了新奇的反向(正向)整流行为,而整流方向与异质结的界面类型无关。研究表明,可通过控制石墨烯/h-BN异质结的宽度设计出具有反转整流特性的纳米器件。

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 reverse(forward)rectification behavior,but the rectifying directions are independent of the interface types of graphene/h-BN hybridized nano-ribbons.The findings in this work demonstrate that graphene/h-BN-based nanodevices with an inversion of rectification behavior can be fabricated by selecting the appropriate nano-ribbon widths.