arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1708.02799cond-mat.mtrl-sci
收藏

单层WS $_2$中的接触诱导半导体-金属转变

Contact-Induced Semiconductor-to-Metal Transition in Single-Layer WS$_2$

Maciej Dendzik, Albert Bruix, Matteo Michiardi, Arlette S. Ngankeu, Marco Bianchi, Jill A. Miwa, Bjørk Hammer, Philip Hofmann, Charlotte E. Sanders

摘要:

低电阻欧姆接触对于基于二维材料的电子器件是一个挑战。我们表明,一个原子级精确的二维半导体和金属接触之间的结可以导致一个电阻到金属过渡的二维材料-这一发现指出了一种可能的方法,实现低电阻结。具体地,单层WS $_2$在Ag(111)上外延生长时经历载流子到金属的转变,而其在Au(111)上保持直接带隙半导体。用芯能级光电子谱的线形分析确定了Ag(111)表面单层的金属性。角分辨光电子能谱定位在WS $_2$布里渊区的Q点附近的金属态。密度泛函理论计算表明,金属态是由Ag体能带和WS $_2$在Q点附近的局域导带底之间的杂化引起的.

英文摘要:

Low-resistance ohmic contacts are a challenge for electronic devices based on two-dimensional materials. We show that an atomically precise junction between a two-dimensional semiconductor and a metallic contact can lead to a semiconductor-to-metal transition in the two-dimensional material--a finding which points the way to a possible method of achieving low-resistance junctions. Specifically, single-layer WS$_2$ undergoes a semiconductor-to-metal transition when epitaxially grown on Ag(111), while it remains a direct band gap semiconductor on Au(111). The metallicity of the single layer on Ag(111) is established by lineshape analysis of core level photoemission spectra. Angle-resolved photoemission spectroscopy locates the metallic states near the Q point of the WS$_2$ Brillouin zone. Density functional theory calculations show that the metallic states arise from hybridization between Ag bulk bands and the local conduction band minimum of WS$_2$ near the Q point.

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。

↑