Quasi-freestanding,striped WS2 monolayer with an invariable band gap on Au(001) |
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| Authors: | Min Hong Xiebo Zhou Jianping Shi Yue Qi Zhepeng Zhang Qiyi Fang Yaguang Guo Yajuan Sun Zhongfan Liu Yuanchang Li Qian Wang Yanfeng Zhang |
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| Affiliation: | 1. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China;Center for Nanochemistry(CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China;2. Center for Nanochemistry(CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China;3. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China;4. State Key Laboratory of Coal-based Low-carbon Energy, ENN Group Co., Ltd., Langfang 065001, China;5. National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, China;6. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China;Center for Applied Physics and Technology, Peking University, Beijing 100871, China |
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| Abstract: | 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 ℃.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. |
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| Keywords: | WS2 Au(001) striped superstructure interfacial interaction STM/STS |
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