螺旋位错对螺旋型硒化铋纳米片电学特性的影响

利用场效应晶体管和导电原子力显微术,系统研究了螺旋型和平面型硒化铋纳米片的电学特性.结果显示,两种纳米片均体现出高的电导率及类金属导电特性.与平面型样品相比,有更高的载流子浓度和更低的迁移率.导电原子力显微术表征表明,螺旋型纳米片中的螺旋位错边缘相比平台有更高的电导,反映出螺旋位错可以提供更多的载流子.补偿了样品的低迁移率特性,提升了样品的电导率.     

Effect of Screw-Dislocation on Electrical Properties of Spiral-Type Bi2Se3 Nanoplates

We systematically investigated the electrical properties of spiral-type and smooth Bi₂Se₃ nanoplates through field effect transistor and conductive atomic force microscopy (CAFM) measurement. It is observed that both nanoplates possess high conductivity and show metallic-like behavior. Compared to the smooth nanoplate, the spiral-type one exhibits the higher carrier concentration and lower mobility. CAFM characterization reveals that the conductance at the screw-dislocation edge is even higher than that on the terrace, implying that the dislocation can supply excess carriers to compensate the low mobility and achieve high conductivity. The unique structure and electrical properties make the spiral-type Bi₂Se₃ nanoplates a good candidate for catalysts and gas sensors.