Fig. 12. Growth process of the high-quality WS2 domains. (a) The orientations of the WS2 grains under H2 (top) and Ar (bottom) atmospheres, respectively. ADF-STEM images of GBs of the as-grown WS2. Reproduced with permission.94 Copyright 2017, American Chemical Society. (b) WS2 domains aligning along the parallel steps and AFM micrographs of the well-aligned WS2 domains on the c-plane sapphire. (c) High-resolution atomic images proving the region without inversion domain boundary. (b and c) Reproduced with permission.95 Copyright 2021, American Chemical Society. (d) Schematic illustration of the atomic sawtooth Au surface. WS2 domains grow along the step edges of the Au surface. (e) SAED pattern indicating the coherent lattice orientation of the WS2 film. (f) Raman intensity mapping exhibiting no prominent oxidized GB lines between the aligned WS2 domains. (d–f) Reproduced with permission.96 Copyright 2021, Wiley-VCH.
