NaCl-Assisted Temperature-Dependent Controllable Growth of Large-Area MoS Crystals Using Confined-Space CVD.

Due to its semiconducting nature, controlled growth of large-area chemical vapor deposition (CVD)-grown two-dimensional (2D) molybdenum disulfide (MoS) has a lot of potential applications in photodetectors, sensors, and optoelectronics. Yet the controllable, large-area, and cost-effective growth of highly crystalline MoS remains a challenge. Confined-space CVD is a very promising method for the growth of highly crystalline MoS in a controlled manner. Herein, we report the large-scale growth of MoS with different morphologies using NaCl as a seeding promoter for confined-space CVD. Changes in the morphologies of MoS are reported by variation in the amount of seeding promoter, precursor ratio, and the growth temperature. Furthermore, the properties of the grown MoS are analyzed using optical microscopy, scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDX), and atomic force microscopy (AFM). The electrical properties of the CVD-grown MoS show promising performance from fabricated field-effect transistors. This work provides new insight into the growth of large-area MoS and opens the way for its various optoelectronic and electronic applications.