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(a) AFM topography of pristine few-layer MoS2 nanoflakes. (b) Raman spectra of MoS2 nanoflakes with different number of layers. (c) KFM image ofpristine few-layer MoS2 nanoflakes. (d) The Fermi level shift of MoS2 nanoflakes on SiO2 substrate as a function of thickness.
(a) AFM topography of annealed MoS2 nanoflakes and (b) Corresponding KFM image of MoS2 nanoflakes. (c) Fermi level shift of annealed MoS2 nanoflakes as a function of thickness.
Schematic charge transfer model of MoS2 nanoflakes on Si/SiO2 substrate before and after annealing.
(a) Schematic setup of electrical measurement of Pt/MoS2/tip by conductive AFM. (b) I-V curves of 3-, 4-, 7-,and 20-layer MoS2 nanoflakes. (c) ln(I/T2 ) verse V curve of 3-, 4-, 7-, and 20-layer MoS2 nanoflakes fitted by the thermonic emission model in the forward bias. (d) ln(I/V2 ) verse 1/V curves for fitting of F-N tunneling model for 3-, 4-, and 7-layers in the reverse bias.
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