Figure 4
From: Modulation of electrical potential and conductivity in an atomic-layer semiconductor heterojunction
STM and STS study of a heterojunction based on bilayer TMDCs.
(a) High-resolution STM image around the bilayer-based heterointerface (Vs = +1.4 V, It = 10 pA). (b) FFT images of left and right sides of (a). (c) Wide-area STM image around the bilayer heterointerface (Vs = +1.2 V, It = 10 pA). (d) dI/dV maps at different sample bias voltages of Vs = 0.7, −1.0, −1.5 and −1.8 V in the same area as (c) (Vs = +1.2 V, It = 10 pA). (e) Averaged dI/dV spectra obtained from the regions indicated by blue (2L WS2), red (WS2/MoS2) and green (interface) squares in (c). (f) dI/dV color scale map calculated from the spatially resolved STS spectra along the white dotted line in (c).
