Relation between conduction property and work function of contact metal in carbon nanotube field-effect transistors
Relation between conduction property and work function of contact metal in carbon nanotube field-effect transistors
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DOI：
10.1088/0957-4484/17/14/011
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发表时间：
2006-07-28
期刊：
影响因子：
3.5
通讯作者：
Mizutani, T.
中科院分区：
文献类型：
--
作者：
Nosho, Y.;Ohno, Y.;Mizutani, T.
研究了碳纳米管场效应晶体管（ntfet）中接触金属的传导特性与功函数之间的关系。导通类型和漏极电流取决于功函数。与Ti和Pd接触电极的ntfet表现为p型导电行为相反，Mg接触电极的器件表现为双极性特性，Ca接触电极的器件表现为n型导电行为。这表明金属/纳米管接触的势垒高度取决于接触金属的功函数，这表明与传统半导体（如Si和GaAs）相比，界面处的费米能级钉住很弱。我们还展示了一种无杂质掺杂的纳米管准pn二极管的非线性整流电流-电压特性，其中阳极和阴极使用具有不同功函数的不同接触金属。
We have investigated the relation between the conduction property and the work function of the contact metal in carbon nanotube field-effect transistors (NTFETs). The conduction type and the drain current are dependent on the work function. In contrast to NTFETs with Ti and Pd contact electrodes, which showed p-type conduction behaviour, devices with Mg contact electrodes showed ambipolar characteristics and most of the devices with Ca contact electrodes showed n-type conduction behaviour. This indicates that the barrier height of the metal/nanotube contact is dependent on the work function of the contact metal, which suggests that the Fermi-level pinning is weak at the interface, in contrast to conventional semiconductors such as Si and GaAs. We have also demonstrated nonlinear rectification current-voltage characteristics in a nanotube quasi-pn diode with no impurity doping, in which different contact metals with different work functions are used for the anode and the cathode.