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近年来,单层Ⅵ族过渡金属氧族化合物成为探索半导体中新奇物理性质的理想研究平台.这些单层直接带隙半导体材料因为多方面独特的性质,引起了人们的广泛关注.本文利用泵浦探测(pump-probe)技术对二硒化钼(MoSe_2)和二硫化钼(MoS_2)的二维合金材料的载流子动力学特性进行了研究.实验结果表明,载流子的弛豫过程会随着混合物MoS_xSe_(2-x)的配置比例发生显著变化.文中对这一结果进行了初步分析,讨论了掺杂对材料载流子散射的影响.因此,可以通过调节MoSe_2和MoS_2混合比例来调控载流子的弛豫时间.
In recent years, the single-layer Ⅵ transition metal-oxygen compounds have become an ideal research platform for exploring the novel physical properties of semiconductors.These single-layer direct-bandgap semiconductors have aroused people’s attention because of their unique properties.In this paper, The carrier-driven dynamics of two-dimensional alloy materials of molybdenum diselenide (MoSe 2) and molybdenum disulfide (MoS 2) were investigated by using pump-probe technique.The experimental results show that the relaxation process of carriers With the mixture of MoS_xSe_ (2-x) of the configuration of the ratio of significant changes in the text of the results of a preliminary analysis to discuss the effect of doping on the material carrier scattering, therefore, by adjusting the MoSe_2 and MoS_2 mixing ratio Regulate carrier relaxation time.