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arXiv 2004.05061cond-mat.mes-hall
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MoS2上肖特基势垒和电输运的应变工程

Strain-engineering the Schottky barrier and electrical transport on MoS2

Ashby Phillip John, Arya Thenapparambil, Madhu Thalakulam

摘要:

应变提供了一种有效的手段来调整电性能,同时保持材料的天然化学成分。与三维固体不同,二维材料可以承受更高水平的弹性应变,从而更容易调整各种电气特性以满足技术需求。在这项工作中,我们探讨了单轴拉伸应变的电输运性质的双层和少层的二硫化钼,一个有前途的二维半导体的效果。对应于面内振动模式的拉曼位移显示出应变的红移,表明面内声子模式的软化。光致发光测量揭示了直接和间接发射峰的红移,表明材料带隙减小。运输测量显示出一个很大的提高,在导电性与高的压阻应变计因子为321优于硅为我们的双层设备。对实验结果进行的模拟显示,除了MoS2的电阻之外,在电接触处的肖特基势垒高度显著降低。我们的研究表明,应变是调整2D材料电性能的重要和通用成分,也可用于设计未来器件工程的高效电接触。

英文摘要:

Strain provides an effective means to tune the electrical properties while retaining the native chemical composition of the material. Unlike three-dimensional solids, two-dimensional materials withstand higher levels of elastic strain making it easier to tune various electrical properties to suit the technology needs. In this work we explore the effect of uniaxial tensile-strain on the electrical transport properties of bi- and few-layered MoS2, a promising 2D semiconductor. Raman shifts corresponding to the in-plane vibrational modes show a redshift with strain indicating a softening of the in-plane phonon modes. Photo luminescence measurements reveal a redshift in the direct and the indirect emission peaks signalling a reduction in the material bandgap. Transport measurements show a substantial enhancement in the electrical conductivity with a high piezoresistive gauge factor of ~ 321 superior to that for Silicon for our bi-layered device. The simulations conducted over the experimental findings reveal a substantial reduction of the Schottky barrier height at the electrical contacts in addition to the resistance of MoS2. Our studies reveal that strain is an important and versatile ingredient to tune the electrical properties of 2D materials and also can be used to engineer high-efficiency electrical contacts for future device engineering.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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