3 years ago

Quasi-freestanding, striped WS 2 monolayer with an invariable band gap on Au(001)

Qian Wang, Yue Qi, Yajuan Sun, Zhepeng Zhang, Yuanchang Li, Qiyi Fang, Zhongfan Liu, Yaguang Guo, Min Hong, Yanfeng Zhang, Xiebo Zhou, Jianping Shi


Revealing the structural/electronic features and interfacial interactions of monolayer MoS2 and WS2 on metals is essential to evaluating the performance of related devices. In this study, we focused on the atomic-scale features of monolayer WS2 on Au(001) synthesized via chemical vapor deposition. Scanning tunneling microscopy and spectroscopy reveal that the WS2/Au(001) system exhibits a striped superstructure similar to that of MoS2/Au(001) but weaker interfacial interactions, as evidenced by experimental and theoretical investigations. Specifically, the WS2/Au(001) band gap exhibits a relatively intrinsic value of ∼2.0 eV. However, the band gap can gradually decrease to ∼1.5 eV when the sample annealing temperature increases from ∼370 to 720 °C. In addition, the doping level (or Fermi energy) of monolayer WS2/Au(001) varies little over the valley and ridge regions of the striped patterns because of the homogenous distributions of point defects introduced by annealing. Briefly, this work provides an in-depth investigation into the interfacial interactions and electronic properties of monolayer MX2 on metal substrates.

Publisher URL: https://link.springer.com/article/10.1007/s12274-017-1601-8

DOI: 10.1007/s12274-017-1601-8

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