Adsorbates as a charge-carrier reservoir for electrostatic carrier doping to graphene
Adsorbates as a charge-carrier reservoir for electrostatic carrier doping to graphene
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DOI：
10.7567/1882-0786/ab5e0b
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发表时间：
2019-12
影响因子：
2.3
通讯作者：
R. Nouchi;Kei-ichiro Ikeda
中科院分区：
文献类型：
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作者：
R. Nouchi;Kei-ichiro Ikeda
电荷载流子库对于静电控制固体中的载流子浓度是必要的。源极/漏极电极在场效应晶体管中用作载流子储存器，但是在基于在待控制的固体下方形成的极性自组装单层的技术中，什么用作储存器仍然是未知的。这里，发现孤立的单层石墨烯的载流子掺杂水平与含有多层石墨烯的薄片中的单层部分的载流子掺杂水平相同，这表明多层部分不是主要的载流子储层，而是吸附物如氧气和水充当主要储层。
A charge-carrier reservoir is necessary for electrostatic control of the carrier concentration in a solid. The source/drain electrodes serve as carrier reservoirs in a field-effect transistor, but it is still unknown what serves as a reservoir in a technique based on a polar self-assembled monolayer formed underneath a solid to be controlled. Here, the carrier doping level of isolated single-layer graphene was found to be the same as that of the single-layer part in a flake containing multilayer graphene, indicating that the multilayer part is not a dominant carrier reservoir but adsorbates like oxygen and water serve as a dominant reservoir.