Current Enhancement And Bipolar Current Modulation Of Top-Gate Transistors Based On Monolayer Mos2 On Three-Layer Wxmo1-Xs2
ACS applied materials & interfaces(2018)
摘要
We demonstrated the top-gate transistors composed of monolayer MoS2 grown on three-layer alloys MoxW1-xS2 prepared by sequential sulfurization of predeposited transition metal films. The elemental mapping of the alloy indicates a uniform distribution of both cations Mo and W in the grown samples. Surprisingly, we find that the drain current of transistors could be enhanced by 2 orders of magnitude as the composition of Mo increases, whereas the gate-controlled current modulation turns bipolar and ultimately vanishes. These features might originate from the formation of in-gap defect states, with modest activation energy for transport and moderate hopping probability for current conduction, or a reduced electronic band gap of the conducting channel because of strain.
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关键词
2D material alloys, heterostructures, activation energy, hopping probability, strained 2D materials, transistors, top gates
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