Two-dimensional (2D) materials have attracted tremendous research interest because of their unique optical, electronic, and mechanical properties which make them suitable building blocks for various electronic and optoelectronic applications. The heterostructures formed by 2D semiconductors can play an important role in modern semiconductor industry. Here, we have grown 2D-CdSe structures over MoS₂ nanosheets via successive ion layer adsorption and reaction method. The dynamics of photoinduced charge carriers in 2D-CdSe nanostructures have been investigated using femtosecond transient absorption spectroscopy. Our photophysical studies infer that charge carrier recombination is monomolecular at low and bimolecular at high excitation densities. Nonetheless, femtosecond Z-scan technique was employed to demonstrate optical limiting behavior of 2D-CdSe films. This study will open up a new avenue of designing 2D nanomaterials for optoelectronic applications.

二维（2D）材料因其独特的光学，电子和机械性能而吸引了巨大的研究兴趣，这使其成为适用于各种电子和光电应用的构建基块。由2D半导体形成的异质结构可以在现代半导体工业中发挥重要作用。在这里，我们在MoS _2上生长了2D-CdSe结构纳米片通过连续的离子层吸附和反应方法。已经使用飞秒瞬态吸收光谱研究了2D-CdSe纳米结构中光诱导的载流子的动力学。我们的光物理研究表明，载流子重组在低激发密度下为单分子，在高激发密度下为双分子。尽管如此，飞秒Z扫描技术仍被用来证明2D-CdSe薄膜的光学限制行为。这项研究将为设计用于光电应用的2D纳米材料开辟一条新途径。