掺杂单壁碳纳米管的电流特性

依据Boltzmann方程及单壁碳纳米管(SWNTs)能量色散关系,对单个掺杂SWNTs(金属型和半导体型)所加偏压、掺杂浓度及管口直径影响输运电流的性质进行数值计算.分析表明,掺杂SWNs中的电流随偏压变化呈现跃变结构;管口直径、掺杂后Fermi能级附近的态密度以及各通道输运电子的能力直接决定电流的特性,如电流强度、跃变间隔及跃变幅度;同时电流的特性也与温度有关.

Current Properties in Doped Single-Walled Carbon Nanotubes

The numerical calculations are performed for the in dividual doped single-walled carbon nanotubes (SWNTs) (metallic and semiconduct or ones) to investigate current properties depending on the bias voltage,doping concentration and tubular diameters within framework of the Boltzmann equation a nd energy dispersion relation of SWNTs.The analysis shows that the current exhib its jump characteristic with varying bias voltage.The current properties,such as the magnitude,jump period and jump amplitude are determined directly by tubular diameter of SWNTs,the state density near Fermi le vel after SWNTs being doped and the capability for transport electrons in differ ent transport channels,as well as current value is influenced by temperature.