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arXiv 1503.08427cond-mat.mtrl-scicond-mat.mes-hall
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过渡金属二硫属化合物量子输运的通用低温欧姆接触

Universal low-temperature Ohmic contacts for quantum transport in transition metal dichalcogenides

Shuigang Xu, Zefei Wu, Huanhuan Lu, Yu Han, Gen Long, Xiaolong Chen, Tianyi Han, Weiguang Ye, Yingying Wu, Jiangxiazi Lin, Junying Shen, Yuan Cai, Yuheng He, Fa… 展开作者

Shuigang Xu, Zefei Wu, Huanhuan Lu, Yu Han, Gen Long, Xiaolong Chen, Tianyi Han, Weiguang Ye, Yingying Wu, Jiangxiazi Lin, Junying Shen, Yuan Cai, Yuheng He, Fan Zhang, Rolf Lortz, Chun Cheng, Ning Wang

摘要:

低载流子迁移率和高接触电阻是阻碍TMDC量子输运研究的两个主要障碍。在这里,我们展示了一种有效的方法来建立低温欧姆接触氮化硼封装TMDC器件的基础上选择性蚀刻和传统的电子束蒸发的金属电极。这种方法适用于近年来最广泛研究的TMDC,包括MoS 2,MoSe 2,WSe 2,WS 2和2 H-MoTe 2。在2K下实现低接触电阻。所有的几层TMDC器件的研究显示出优异的性能与显着改善的场效应迁移率范围从2300 cm 2/V s到16000 cm 2/V s,作为验证提取的高载流子迁移率从霍尔效应测量。此外,通过简单地使用适当的接触金属,可以实现高迁移率的n型和p型TMDC沟道。在这些高质量的TMDC器件中观察到了显著的Shubnikov-de Haas振荡。

英文摘要:

Low carrier mobility and high electrical contact resistance are two major obstacles prohibiting explorations of quantum transport in TMDCs. Here, we demonstrate an effective method to establish low-temperature Ohmic contacts in boron nitride encapsulated TMDC devices based on selective etching and conventional electron-beam evaporation of metal electrodes. This method works for most extensively studied TMDCs in recent years, including MoS2, MoSe2, WSe2, WS2, and 2H-MoTe2. Low electrical contact resistance is achieved at 2 K. All of the few-layer TMDC devices studied show excellent performance with remarkably improved field-effect mobilities ranging from 2300 cm2/V s to 16000 cm2/V s, as verified by the high carrier mobilities extracted from Hall effect measurements. Moreover, both high-mobility n-type and p-type TMDC channels can be realized by simply using appropriate contact metals. Prominent Shubnikov-de Haas oscillations have been observed and investigated in these high-quality TMDC devices.

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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