异质结
石墨烯
材料科学
化学气相沉积
应变工程
拉伤
工作(物理)
开尔文探针力显微镜
工作职能
光电子学
纳米技术
图层(电子)
凝聚态物理
原子力显微镜
硅
物理
内科学
热力学
医学
作者
Lan Meng,Yuhan Zhang,Song Hu,Xiangfu Wang,Chunsheng Liu,Yan-Dong Guo,Xinran Wang,Xin Yan
摘要
“Strain engineering” has been widely used to tailor the physical properties of layered materials, like graphene, black phosphorus, and transition-metal dichalcogenides. Here, we exploit thermal strain engineering to construct two dimensional (2D) WS2 in-plane heterojunctions. Kelvin probe force microscopy is used to investigate the surface potentials and work functions of few-layer WS2 flakes, which are grown on SiO2/Si substrates by chemical vapor deposition, followed by a fast cooling process. In the interior regions of strained WS2 flakes, work functions are found to be much larger than that of the unstrained regions. The difference in work functions, together with the variation of band gaps, endows the formation of heterojunctions in the boundaries between inner and outer domains of WS2 flakes. This result reveals that the existence of strain offers a unique opportunity to modulate the electronic properties of 2D materials and construct 2D lateral heterojunctions.
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