The effective synthesis of two-dimensional transition metal dichalcogenides alloy is essential for successful application in electronic and optical devices based on a tunable band gap. Here we show a synthesis process for Mo1-xWxS2 alloy using sulfurization of super-cycle atomic layer deposition Mo1-xWxOy. Various spectroscopic and microscopic results indicate that the synthesized Mo1-xWxS2 alloys have complete mixing of Mo and W atoms and tunable band gap by systematically controlled composition and layer number. Based on this, we synthesize a vertically composition-controlled (VCC) Mo1-xWxS2 multilayer using five continuous super-cycles with different cycle ratios for each super-cycle. Angle-resolved X-ray photoemission spectroscopy, Raman and ultraviolet-visible spectrophotometer results reveal that a VCC Mo1-xWxS2 multilayer has different vertical composition and broadband light absorption with strong interlayer coupling within a VCC Mo1-xWxS2 multilayer. Further, we demonstrate that a VCC Mo1-xWxS2 multilayer photodetector generates three to four times greater photocurrent than MoS2- and WS2-based devices, owing to the broadband light absorption.

中文翻译：

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用于垂直成分控制的多层材料的可控合成二硫化钼钨合金。

有效地合成二维过渡金属二硫化氢合金对于基于可调带隙的电子和光学设备的成功应用至关重要。在这里，我们展示了利用超循环原子层沉积Mo1-xWxOy的硫化方法合成Mo1-xWxS2合金的过程。各种光谱和显微结果表明，通过系统地控制组成和层数，合成的Mo1-xWxS2合金具有Mo和W原子的完全混合以及可调节的带隙。基于此，我们使用五个连续的超级循环（每个超级循环具有不同的循环比率）合成了垂直成分控制（VCC）的Mo1-xWxS2多层。角分辨X射线光发射光谱，拉曼光谱和紫外可见分光光度计的结果表明，VCC Mo1-xWxS2多层膜具有不同的垂直组成和宽带光吸收，并且在VCC Mo1-xWxS2多层膜内具有很强的层间耦合。此外，由于宽带光吸收，我们证明了VCC Mo1-xWxS2多层光电探测器产生的光电流是MoS2和WS2基器件的三到四倍。