2D semiconductors could make negative conductance devices

 NTC devices are promising for low-power logical circuits, memories, oscillating and high-speed switching applications. In a typical n-type NTC transistor, the output current decreases with increasing gate voltage. It increases with increasing gate voltage in a p-type NTC device.

Previous NTC devices were found to work by either quantum-mechanical tunnelling or thanks to charge mobilities degrading at high electrical fields. A team of researchers led by Xiangfeng Duan of the University of California at Los Angeles (UCLA) has now discovered a third possible mechanism by investigating the charge transport in multilayer 2D semiconductors (2DSCs) made from MoS2 containing optimized van der Waals contacts.


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