E, boule Cthe undulationcenter where Close to facet edge 8000 nm 10.0 Figure 3a
E, boule Cthe undulationcenter exactly where Close to facet edge 8000 nm 10.0 Figure 3a .Figure 3. Schematic figures with the separation-undulated step structures on a vicinal crystal surface, Figure 3. Schematic figures in the separation-undulated step structures on a vicinal crystal(b) to (c). exactly where the undulation wavelength of step separation (terrace width) increases from (a) to surface, exactly where the undulation wavelength of step separation (terrace width) increases from (a) to (b) to (c).We could not observe any undulation within the step separation on the (0001) facet edge of boule A (the nominally undoped boule), to which we assigned an undulation wavelength of 70 nm, comparable to or significantly less than the step separation. As shown within the table, because the nitrogen doping Diversity Library Physicochemical Properties concentration enhanced (from boule A to boule B to boule C), the undulation wavelength considerably increased. To shed a lot more light on the observed undulated step structure near the facet edge, we examined the step structure inside the central region (near a spiral growth center) with the (0001) facet. Figure 4a show the AFM pictures of the step structures observed at Points A’, B’, and C’ on the facets of boules A, B, and C, respectively, shown in Figure 1. In every single figure, a set of wide-area AFM photos (50- square or 30- square location) and small-area photos (25- square or 10- square area) are shown; the place of your small-area AFM image is indicated by a blue-line open square shown inside the wide-area image. As shown inside the figures, the facet surface within the central region was also covered with half unit-cell height step trains, which have been also undulated at a specific wavelength. The step separation as well as the undulation wavelength of your step separation inside the central region of your (0001) facet of boules A, B, and C are summarized in Table 1, exactly where the wavelength of boule A couldn’t be measured, because the step separation was substantially substantial. For boule B, undulated step structures were observed in really restricted areas within the central region on the facet. We very carefully examined the central area on the facet of boule B and found that undulated step structures had been rarely observed inside the area. As noticed in the table, the undulationlation wavelength of step separation around the 4H-SiC (0001) facet. A single vital conclusion_Materials 2021, 14,for the observed undulation of step separation (step bunching) around the (0001) facet of nitrogen-doped 4H-SiC boules is the fact that the undulation wavelength became longer when the nitrogen doping concentration enhanced. As described earlier in this section, the nitrogen doping concentration also affects the six of 12 line profile of surface methods. The AFM GSK2646264 Epigenetic Reader Domain images shown in Figure four indicate that the meandering wavelength of the half unit-cell height measures became shorter as the nitrogen doping concentration improved, except for in boule C; we discuss the cause why relatively straight _ wavelength on the step separation was pretty equivalent for boules B and C and appeared not to methods have been observed on the (0001) facet of boule C below. be dependent on the nitrogen doping concentration.Figure four. AFM photos of the step structures observed (a) Point A’, (b) Point B’, and (c) Point C’ C’ Figure 4. AFM images with the step structures observed atat (a) Point A’, (b) Point B’, and (c) Point in _ thethe central area (near a spiral growth center) of (0001) facetfacet of boules A, B,C, respectively, in central area (close to a spiral growth center) in the the (0001) of boules A, B, and and C, respecshown.
