Theoretical study on strain-controllable gradient Schottky barrier of dumbbell-shape graphene nanoribbon for highly sensitive strain sensors
Theoretical study on strain-controllable gradient Schottky barrier of dumbbell-shape graphene nanoribbon for highly sensitive strain sensors
复制标题
高灵敏应变传感器用哑铃形石墨烯纳米带应变可控梯度肖特基势垒的理论研究
DOI：
10.1109/sispad54002.2021.9592548
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Qinqiang Zhang; Ken Suzuki; Hideo Miura
中科院分区：
文献类型：
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作者：
関根 北斗;畑 悠希;小泉 宏之;小紫 公也;Qinqiang Zhang; Ken Suzuki; Hideo Miura
本文采用第一性原理计算方法，分析了哑铃形石墨烯纳米带结构中应变诱导的电子传导特性变化，以及哑铃形结构中金属GNR（石墨烯纳米带）与半导体GNR连接界面周围的电子带结构。哑铃形GNR在单轴应变作用下表现出复杂的电流-电压特性。这种复杂行为的主要原因是在单轴拉伸应变作用下，金属GNR与半导体GNR之间新形成的原子无缝界面周围存在应变引起的梯度肖特基势垒变化。原子无缝界面周围新形成的梯度肖特基势垒的能带图与传统的阶梯状金属-半导体界面的能带图完全不同。这种梯度肖特基势垒的能量高度可以通过施加适当的拉伸应变范围来调节。这种由应变引起的哑铃形GNR电子带结构的变化为开发具有稳定电子性能的高灵敏度应变传感器提供了巨大的潜力。
The strain-induced change of electronic conduction properties in the dumbbell-shape graphene nanoribbon structure and the electronic band structure around the jointed interface between the metallic GNR (Graphene NanoRibbon) and the semiconductive GNR in the proposed dumbbell-shape structure were analyzed by using first-principles calculations in this study. The dumbbell-shape GNR exhibited a complicated current-voltage characteristics under the application of uniaxial strain. The main reason for the complicated behavior was attributed to the existence of the strain-induced change of gradient Schottky barrier around the newly formed atomic seamless interface between the metallic GNR and semiconductive GNR under the application of uniaxial tensile strain. The band diagram of the newly formed gradient Schottky barrier around atomic seamless interface was completely different with that of the conventional step-like metal-semiconductor interface. This energy height of gradient Schottky barrier can be modulated by applying an appropriate range of tensile strain. This strain-induced change of the electronic band structure of dumbbell-shape GNR showed a great potential for developing a highly sensitive strain sensor with stable electronic performance.