Presentation Information
[1G05]Advanced Synthesis Strategies for Monolayer TMDCs: Structural Control from Millimeter-Scale Growth to Atomic-Level Configuration
*Hiroo Suzuki1 (1. Faculty of Environment, Life, and Natural Science and Technology, Okayama University)
Transition metal dichalcogenides (TMDCs), as two-dimensional semiconductors, show promise for optoelectronic devices due to their direct bandgap and excellent optical properties. In this talk, we present three studies on multi-scale synthesis control of monolayer TMDCs. First, large-area monolayer WS2 single crystals were synthesized via vapor-liquid-solid growth in a substrate-stacked microreactor. In situ observation revealed various growth modes, including abnormal nanoribbon formation. Precise control further enabled dendritic WS2 structures with high HER activity. Second, WS2 nanoribbons were fabricated using WxOy nanowires as templates, which were grown by reacting Na2WO4 with an organosulfur compound. The resulting nanoribbons were exfoliated and used in FET devices. Third, Janus TMDCs like MoSeS were synthesized via a room-temperature atomic substitution technique. Optical and structural evolution during the substitution process revealed abnormal intermediate optical behaviors.