Fig. 2. CG-TC SECCM imaging of carrier transport within basal planes of n-WSe₂ nanosheets. (a) Photocurrent images at a series of different applied potentials (1 µm resolution). (b) Optical transmission image of the n-WSe₂ nanosheet with the area imaged via SECCM and location of the AFM height profile indicated. (c) AFM height profile of the n-WSe₂ nanosheet. (d) Cross-sections of the SECCM photocurrent images given in (a). (e) Example voltammograms obtained at different points within the imaged area. SECCM data was acquired using a pipet (d = 400 nm, θ_p = 10°) filled with an aqueous solution containing 100 mM NaI, 10 mM I₂ at a sweep rate of 2000 mV s⁻¹. Imaging was carried out in the vicinity of a 633 nm Gaussian beam with P₀ = 600 nW and σ₀ = 0.73 µm.