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arXiv 1503.00393cond-mat.mtrl-sci
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从电极接触和表面吸附物到石墨烯的竞争性界面电荷转移

Competitive interfacial charge transfer to graphene from the electrode contacts and surface adsorbates

Ryo Nouchi, Katsumi Tanigaki

摘要:

金属-石墨烯接触处的电荷转移(CT)引起从接触边缘延伸至约1微米的电位变化。在电荷转移表面吸附物周围应观察到具有类似长度的电势变化。因此,预期当一个源与另一个源在约1微米内时,这两个CT源之间存在竞争。在这封信中,弱耦合Ni触点和7,7,8,8-四氰基醌二甲胺分子被用作CT源,以研究它们可能的竞争。来自仅吸附在沟道区中的分子的CT改变了下接触区中的石墨烯的电荷密度。在下接触区域中的CT效应的范围长达~4微米。相当长的CT归因于接触下的石墨烯的高有效介电常数,这是由包含从石墨烯获得的碳杂质的薄界面NiOx层引起的。

英文摘要:

Charge transfer (CT) at metal-graphene contacts induces a potential variation from the contact edges that extends to ~1 micrometer. Potential variations with a similar length should be observed around charge-transferring surface adsorbates. Thus, it is expected that a competition exists between these two CT sources when one source is within ~1 micrometer from the other. In this letter, weakly-coupled Ni contacts and 7,7,8,8-tetracyanoquinodimethan molecules are employed as the CT sources to investigate their possible competition. The CT from the molecules adsorbed only in the channel region change the charge density of the graphene in the under-contact regions. The extent of the CT effect in the under-contact region is as long as ~4 micrometers. The considerably long CT is ascribed to the high effective dielectric constant of the graphene under the contacts, resulting from a thin interfacial NiOx layer containing carbon impurities acquired from the graphene.

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