The alloying of two-dimensional (2D) transition metal dichalcogenides (TMDs) is an established route to produce robust semiconductors with continuously tunable optoelectronic properties. However, typically reported methods for fabricating alloyed 2D TMD nanosheets are not suitable for the inexpensive, scalable production of large-area (m²) devices. Herein we describe a general method to afford large quantities of compositionally-tunable 2D TMD nanosheets using commercially available powders and liquid-phase exfoliation. Beginning with Mo_(1−x)W_xS₂ nanosheets, we demonstrate tunable optoelectronic properties as a function of composition. We extend this method to produce Mo_0.5W_0.5Se₂ MoSSe, WSSe, and quaternary Mo_0.5W_0.5SSe nanosheets. High-resolution scanning transmission electron microscopy (STEM) imaging confirms the atomic arrangement of the nanosheets, while an array of spectroscopic techniques is used to characterize the chemical and optoelectronic properties. This transversal method represents an important step towards upscaling tailored TMD nanosheets with a broad range of tunable optoelectronic properties for large-area devices.

中文翻译：

---

通过可扩展、可溶液加工的方法制备成分可调的过渡金属二硫属化物纳米片

二维 (2D) 过渡金属二硫属化物 (TMD) 的合金化是生产具有连续可调光电特性的坚固半导体的既定途径。然而，通常报道的制造合金化2D TMD纳米片的方法并不适合廉价、可扩展的大面积（m ²）器件的生产。在此，我们描述了一种使用市售粉末和液相剥离来提供大量成分可调的 2D TMD 纳米片的通用方法。从Mo _{(1− x )} W _x S ₂纳米片开始，我们展示了作为成分函数的可调光电特性。我们扩展了这种方法来生产 Mo _0.5 W _0.5 Se ₂ MoSSe、WSSe 和四元 Mo _0.5 W _0.5 SSe 纳米片。高分辨率扫描透射电子显微镜（STEM）成像证实了纳米片的原子排列，同时一系列光谱技术用于表征化学和光电特性。这种横向方法代表了向大面积器件升级定制TMD纳米片的重要一步，该纳米片具有广泛的可调光电特性。