A novel 2-step ALD route to ultra-thin MoS2 films on SiO2 through a surface organometallic intermediate

作者：Cadot Stephane; Renault Olivier; Fregnaux Mathieu; Rouchon Denis; Nolot Emmanuel; Szeto Kai; Thieuleux Chloe; Veyre Laurent; Okuno Hanako; Martin Francois; Quadrelli Elsje Alessandra

来源：Nanoscale, 2017, 9(2): 538-546.

DOI：10.1039/c6nr06021h

The lack of scalable-methods for the growth of 2D MoS2 crystals, an identified emerging material with applications ranging from electronics to energy storage, is a current bottleneck against its large-scale deployment. We report here a two-step ALD route with new organometallic precursors, Mo(NMe2)(4) and 1,2-ethanedithiol (HS(CH2)(2)SH) which consists in the layer-by-layer deposition of an amorphous surface Mo(IV) thiolate at 50 degrees C, followed by a subsequent annealing at higher temperature leading to ultra-thin MoS2 nanocrystals (similar to 20 nm-large) in the 1-2 monolayer range. In contrast to the usual high-temperature growth of 2D dichalcogenides, where nucleation is the key parameter to control both thickness and uniformity, our novel two-step ALD approach enables chemical control over these two parameters, the growth of 2D MoS2 crystals upon annealing being ensured by spatial confinement and facilitated by the formation of a buffer oxysulfide interlayer.

• 出版日期2017-1-14
• 单位中国地震局