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Title: Monolayer MoS{sub 2} self-switching diodes

This paper presents a new molybdenum disulphide (MoS{sub 2}) nanodevice that acts as a two-terminal field-effect rectifier. The device is an atomically-thin two-dimensional self-switching diode (SSD) that can be realized within a single MoS{sub 2} monolayer with very minimal process steps. Quantum simulation results are presented confirming the device's operation as a diode and showing strong non-linear I-V characteristics. Interestingly, the device shows p-type behavior, in which conduction is dominated by holes as majority charge carriers and the flow of reverse current is enhanced, while the flow of forward current is suppressed, in contrast to monolayer graphene SSDs, which behave as n-type devices. The presence of a large bandgap in monolayer MoS{sub 2} results in strong control over the channel, showing complete channel pinch-off in forward conduction, which was confirmed with transmission pathways plots. The device exhibited large leakage tunnelling current through the insulating trenches, which may have been due to the lack of passivation; nevertheless, reverse current remained to be 6 times higher than forward current, showing strong rectification. The effect of p-type substitutional channel doping of sulphur with phosphorus was investigated and showed that it greatly enhances the performance of the device, increasing the reverse-to-forward current rectification ratiomore » more than an order of magnitude, up to a value of 70.« less
Authors:
;  [1] ;  [2] ;  [2] ; ;  [1] ;  [2] ;  [3] ;  [1] ;  [4]
  1. Department of Electrical and Electronic Engineering, University of Melbourne, Victoria (Australia)
  2. (Australia)
  3. Princess Sumaya University for Technology, Amman (Jordan)
  4. (MNSI), University of Melbourne, Victoria (Australia)
Publication Date:
OSTI Identifier:
22494948
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 119; Journal Issue: 4; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CURRENTS; ELECTRIC CONDUCTIVITY; GRAPHENE; MOLYBDENUM; MOLYBDENUM SULFIDES; PHOSPHORUS; RECTIFIERS; SWITCHING DIODES; TUNNEL EFFECT; TWO-DIMENSIONAL SYSTEMS