title: Novel chemical route for atomic layer deposition of MoS₂ thin film on SiO₂/Si substrate.
abstract: Recently MoS₂ with a two-dimensional layered structure has attracted great attention as an emerging material for electronics and catalysis applications. Although atomic layer deposition (ALD) is well-known as a special modification of chemical vapor deposition in order to grow a thin film in a manner of layer-by-layer, there is little literature on ALD of MoS₂ due to a lack of suitable chemistry. Here we report MoS₂ growth by ALD using molybdenum hexacarbonyl and dimethyldisulfide as Mo and S precursors, respectively. MoS₂ can be directly grown on a SiO₂/Si substrate at 100 °C via the novel chemical route. Although the as-grown films are shown to be amorphous in X-ray diffraction analysis, they clearly show characteristic Raman modes (E(1)₂g and A₁g) of 2H-MoS₂ with a trigonal prismatic arrangement of S-Mo-S units. After annealing at 900 °C for 5 min under Ar atmosphere, the film is crystallized for MoS₂ layers to be aligned with its basal plane parallel to the substrate.
authors.affiliation: Department of Chemical Engineering, Konkuk University, 120 Neungdong-Ro, Gwangjin-Gu, Seoul 143-701, Korea. ysmin@konkuk.ac.kr.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Jin
authors.forename: Seokhee
authors.initials: S
authors.lastname: Shin
authors.forename: Do Hyun
authors.initials: DH
authors.lastname: Kwon
authors.forename: Seung-Joo
authors.initials: SJ
authors.lastname: Han
authors.forename: Yo-Sep
authors.initials: YS
authors.lastname: Min