Achieving large transport bandgaps in bilayer graphene  

作　　者：Tao Chu Zhihong Chen 

机构地区：[1]SchoolofElectricalandComputerEngineeringandBirckNanotechnologyCenter,PurdueUniversity,WestLafayette,IN47907,USA

出　　处：《Nano Research》2015年第10期3228-3236,共9页纳米研究（英文版）

摘　　要：Since opening sizable bandgaps in bilayer graphene （BLG） was proven possible, BLG has attracted considerable attention as a promising high-mobility candidate material for many electronic and optoelectronic applications. However, the bandgaps observed in the transport experiments reported in the literature are far smaller than both the theoretical predictions and the bandgaps extracted from optical measurements. In this study, we investigate the factors preventing the formation of large bandgaps and demonstrate that a -200-meV transport bandgap can be opened in BLG by scaling the gate dielectric and employing a ribbon channel to suppress the percolative transport. This is the largest transport bandgap that has been achieved in BLG to date.因为在 bilayer graphene (BLG ) 的开的相当大的 bandgaps 被证明可能， BLG 为电子的许多和 optoelectronic 应用作为有希望的高活动性的候选人材料吸引了可观的注意。然而，在实验在文学报导了的运输观察的 bandgaps 比从光大小提取的理论预言和 bandgaps 远小。在这研究，我们调查阻止大 bandgaps 的形成的因素并且证明 ~200 兆电子伏运输 bandgap 能被放大门电介质并且采用一条带子隧道压制 percolative 运输在 BLG 打开。这是迄今为止在 BLG 被完成了的最大的运输 bandgap。

关 键 词：bilayer graphene transport bandgap PERCOLATION on/off ratios 

分 类 号：TQ336.2[化学工程—橡胶工业] TQ127.11