Figure 2
(a) Optical microscopy image of the 2D C8-BTBT crystalline films. The bilayer and trilayer are clearly observed. Scale bar, 20 μm. (b) AFM morphology image of the step between bilayer and trilayer films (red square in (a)). Scale bar, 500 nm. (c) AFM morphology image of the step between bilayer films and the substrate (blue square in (a)). Scale bar, 500 nm. (d) AFM morphology image of uniform bilayer films (brown square in (a)). Scale bar, 500 nm. (e) High-resolution AFM image of the bilayer C8-BTBT molecules on the AlOx/Si substrate. Scale bar, 1 nm. The inset shows the corresponding fast Fourier transforms of the AFM image with lattice indices.
