Iodine-assisted CVD grown MoS₂ with high quality and uniformity. (A), (B) The typical Raman and PL of the MoS₂, respectively. (C) Low temperature PL of the MoS₂ at 80 K. (D), (E) Line-scan Raman spectra and PL spectra of the MoS₂, and the inset in (D) is the OM image of the corresponding MoS₂ domain. (F) Typical fluorescence image of the as-grown MoS₂ with large size. (G) AFM image at the corner of a MoS₂ domain. (H), (I) IFFT HRAFM image at the inner and edge parts of the MoS₂ domain in (G).