Advanced Materials Interfaces | 2019

Ultralow Specific Contact Resistivity in Metal–Graphene Junctions via Contact Engineering

 
 
 
 
 
 
 
 

Abstract


A systematic investigation of graphene edge contacts is provided. Intentionally patterning monolayer graphene at the contact region creates well-defined edge contacts that lead to a 67% enhancement in current injection from a gold contact. Specific contact resistivity is reduced from 1372 {\\Omega}m for a device with surface contacts to 456 {\\Omega}m when contacts are patterned with holes. Electrostatic doping of the graphene further reduces contact resistivity from 519 {\\Omega}m to 45 {\\Omega}m, a substantial decrease of 91%. The experimental results are supported and understood via a multi-scale numerical model, based on density-functional-theory calculations and transport simulations. The data is analyzed with regards to the edge perimeter and hole-to-graphene ratio, which provides insights into optimized contact geometries. The current work thus indicates a reliable and reproducible approach for fabricating low resistance contacts in graphene devices. We provide a simple guideline for contact design that can be exploited to guide graphene and 2D material contact engineering.

Volume 6
Pages 1801285
DOI 10.1002/admi.201801285
Language English
Journal Advanced Materials Interfaces

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