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Achieving large-size two-dimensional (2D) crystals is key to fully exploitingtheir remarkable functionalities and application potentials. Chemical vapordeposition (CVD) growth of 2D semiconductors such as monolayer MoS2 has beenreported to be activated by halide salts, yet clear identification of theunderlying mechanism remains elusive. Here we provide unambiguous experimentalevidence showing that the MoS2 growth dynamics are halogen-dependent throughthe Br{\o}nsted-Evans-Polanyi relation, based on which we build a growth modelby considering MoS2 edge passivation by halogens, and theoretically reproducesthe trend of our experimental observations. These mechanistic understandingsenable us to further optimize the fast growth of MoS2 and reach record-largedomain sizes that should facilitate practical applications.

Revealing the Br{\o}nsted-Evans-Polanyi Relation in Halide-Activated Fast MoS2 Growth Towards Millimeter-Sized 2D Crystals