The electronic transport and photoconduction properties of the molybdenum diselenide (MoSe₂) nanosheets were investigated. The transfer length method analysis suggests the electric current following an anomalously two-dimensional (2D) flow rather than the general 3D mode. The 2D current implies a higher electron concentration and downward band bending at the surface. A broad spectral photoresponse from ultraviolet to near-infrared wavelengths was also observed for the MoSe₂ nanosheets. The optimal responsivity and photoconductive gain respectively at 58 A/W and 179 under the wavelengths at 405 nm were achieved. A surface-controlled photoconduction mechanism based on the surface band bending and electron accumulation is proposed to explain the long carrier lifetime and its dependence of light intensity and environment in MoSe₂ nanostructures.

研究了二硒化钼 (MoSe ₂ ) 纳米片的电子传输和光电导特性。传输长度方法分析表明电流遵循异常二维 (2D) 流动而不是一般的 3D 模式。2D 电流意味着更高的电子浓度和表面向下的带弯曲。MoSe ₂还观察到了从紫外到近红外波长的宽光谱光响应纳米片。在 405 nm 波长下分别在 58 A/W 和 179 处实现了最佳响应度和光电导增益。提出了一种基于表面带弯曲和电子积累的表面控制光电导机制来解释 MoSe ₂纳米结构中的长载流子寿命及其对光强度和环境的依赖性。