Fig. 19.

Strategies for enhancing crystal domain sizes. a Effect of the amount of precursor on nucleation and growth during CVD synthesis of MoS₂ to provide optimum crystal domain size. Adapted with permission from Ref. [25]. Copyright 2017, Wiley. b, c Oxygen-assisted CVD growth of MoS₂ leads to an increase in domain size in 30 min; however, domains start to etch away if growth time is increased further. Adapted with permission from Ref. [56]. Copyright 2015, ACS Publications. d–f Diffusion-controlled growth of WSe₂ by optimising ripening step showing domain size, cluster density and substrate coverage as a function of ripening time. g, h Effect of growth step time on area coverage highlighting the domain direction statistics. i Effect of substrate temperature on domain size and density. Adapted with permission from Ref. [173]. Copyright 2018, ACS Publications