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Title: Design of Atomically Precise Nanoscale Negative Differential Resistance Devices

Journal Article · · Advanced Theory and Simulations

Abstract Downscaling device dimensions to the nanometer range raises significant challenges to traditional device design, due to potential current leakage across nanoscale dimensions and the need to maintain reproducibility while dealing with atomic‐scale components. Here, negative differential resistance (NDR) devices based on atomically precise graphene nanoribbons are investigated. The computational evaluation of the traditional double‐barrier resonant‐tunneling diode NDR structure uncovers important issues at the atomic scale, concerning the need to minimize the tunneling current between the leads while achieving high peak current. A new device structure consisting of multiple short segments that enables high current by the alignment of electronic levels across the segments while enlarging the tunneling distance between the leads is proposed. The proposed structure can be built with atomic precision using a scanning tunneling microscope (STM) tip during an intermediate stage in the synthesis of an armchair nanoribbon. An experimental evaluation of the band alignment at the interfaces and an STM image of the fabricated active part of the device are also presented. This combined theoretical–experimental approach opens a new avenue for the design of nanoscale devices with atomic precision.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; DE‐FG02‐98ER45685
OSTI ID:
1489088
Alternate ID(s):
OSTI ID: 1488621
Journal Information:
Advanced Theory and Simulations, Vol. 2, Issue 2; ISSN 2513-0390
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (6)

Atomic‐Scale Manipulation and In Situ Characterization with Scanning Tunneling Microscopy journal October 2019
Step edge-mediated assembly of periodic arrays of long graphene nanoribbons on Au(111) journal January 2019
Light Driven Active Transition of Switching Modes in Homogeneous Oxides/Graphene Heterostructure journal April 2019
Ultranarrow heterojunctions of armchair-graphene nanoribbons as resonant-tunnelling devices journal January 2019
QuantumATK: An integrated platform of electronic and atomic-scale modelling tools text January 2019
Step edge-mediated assembly of periodic arrays of long graphene nanoribbons on Au(111) preprint January 2019

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