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Coulomb drag transistor using a graphene and MoS 2 heterostructure
Communications Physics ( IF 5.5 ) Pub Date : 2020-10-27 , DOI: 10.1038/s42005-020-00461-8
Youngjo Jin , Min-Kyu Joo , Byoung Hee Moon , Hyun Kim , Sanghyup Lee , Hye Yun Jeong , Young Hee Lee

Two-dimensional (2D) heterostructures often provide extraordinary carrier transport as exemplified by superconductivity or excitonic superfluidity. Recently, a double-layer graphene (Gr) separated by few-layered boron nitride demonstrated the Coulomb drag phenomenon: carriers in the active layer drag carriers in the passive layer. Here, we propose high-performance Gr/MoS2 heterostructure transistors operating via Coulomb drag, exhibiting a high carrier mobility (3700 cm2 V−1 s−1) and on/off-current ratio (108) at room temperature. The van der Waals gap at the Gr/MoS2 interface induces strong interactions between the interlayer carriers, whose recombination is suppressed by the Schottky barrier between p-Gr and n-MoS2, clearly distinct from the presence of insulating layers. The sign reversal of lateral voltage clearly demonstrates the Coulomb drag in carrier transport. Hole-like behavior of electrons in the n-MoS2 is observed in magnetic field, indicating strong Coulomb drag at low temperature. Our Coulomb drag transistor thus provides a shortcut for the practical application of 2D heterostructures.



中文翻译:

使用石墨烯和MoS 2异质结构的库仑拖动晶体管

二维(2D)异质结构通常提供非凡的载流子传输,例如超导性或激子超流体性。最近,由几层氮化硼分隔的双层石墨烯(Gr)表现出库仑拖曳现象:有源层中的载流子拖曳了钝化层中的载流子。这里,我们提出高性能的Gr / MOS 2经由库仑拖拉操作异质结构的晶体管,(表现出高载流子迁移 3700厘米2  V -1 小号-1)和开/关电流比( 10 8)在室温下。Gr / MoS 2处的范德华间隙界面引起层间载流子之间的强相互作用,其重组被p -Gr和n -MoS 2之间的肖特基势垒抑制,这明显不同于绝缘层的存在。横向电压的符号反转清楚地表明了库仑在载流子传输中的阻力。在磁场中观察到n -MoS 2中电子的空穴状行为,表明低温下有很强的库仑阻力。因此,我们的库仑阻力晶体管为2D异质结构的实际应用提供了捷径。

更新日期:2020-10-28
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