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Chalcogen and Substrate Control of Large-Area 2D Dichalcogenide Exfoliation

How the choice of chalcogen (sulfur versus selenium) and metal substrate (gold versus silver) governs the yield and quality of large-area monolayer WS2 and WSe2 produced by the non-destructive kinetic in situ single-layer synthesis (KISS) method, with WSe2 giving larger monolayers and no covalent film-substrate bonding.