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Identically sized Co quantum dots on monolayer WS2featuring Ohmic contact
Physical Review Applied ( IF 4.532 ) Pub Date : 
Weiqing Tang, Mingming Fu, Jiajun Chen, Baofan Sun, Congming Ke, Yaping Wu, Xu Li, Chunmiao Zhang, Zhiming Wu, and Junyong Kang

Identically-sized Co quantum dots (QDs) are constructed on monolayer tungdten disulfide (WS2) forming coupled heterostructures. Topographical images investigated by in situ scanning tunneling microscopy (STM) show a bias-dependent feature. First-principles calculated binding energies combined with the simulated STM images identify that the Co QDs possess a unique magic number, with a tetrahedral Co4 configuration. Numerical differential conductance measured by scanning tunneling spectroscopy (STS) indicates a p-type doping and an Ohmic contact property for the Co4/WS2 system. Mechanism of the novel transport and conduction properties of the coupled heterostructures is further revealed by analyzing the work functions and interfacial interaction. Our findings offer some references for the controlled fabrication of identically-sized zero-dimensional/two-dimensional (0D/2D) heterostructures and propose a feasible strategy for Ohmic interface contact in nanodevices.
更新日期:2020-01-14

 

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