Super-Joule heating in graphene and silver nanowire network

Transistors, sensors, and transparent conductors based on randomly assembled nanowire networks rely on multi-component percolation for unique and distinctive applications in flexible electronics, biochemical sensing, and solar cells. While conduction models for 1-D and 1-D/2-D networks have been dev...

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Bibliographic Details
Published in:Applied physics letters 2015-04, Vol.106 (14)
Main Authors: Maize, Kerry, Das, Suprem R., Sadeque, Sajia, Mohammed, Amr M. S., Shakouri, Ali, Janes, David B., Alam, Muhammad A.
Format: Article
Language:English
Subjects:
Applied physics
Conduction model
Conductors
Electron transport
Electronic devices
Flexible components
Graphene
High resolution
Image resolution
Nanowires
Ohmic dissipation
Percolation
Photovoltaic cells
Resistance heating
Semiconductor devices
Solar cells
Spatial resolution
Thermal imaging
Thermal response
Transistors
Two dimensional models
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Summary:Transistors, sensors, and transparent conductors based on randomly assembled nanowire networks rely on multi-component percolation for unique and distinctive applications in flexible electronics, biochemical sensing, and solar cells. While conduction models for 1-D and 1-D/2-D networks have been developed, typically assuming linear electronic transport and self-heating, the model has not been validated by direct high-resolution characterization of coupled electronic pathways and thermal response. In this letter, we show the occurrence of nonlinear “super-Joule” self-heating at the transport bottlenecks in networks of silver nanowires and silver nanowire/single layer graphene hybrid using high resolution thermoreflectance (TR) imaging. TR images at the microscopic self-heating hotspots within nanowire network and nanowire/graphene hybrid network devices with submicron spatial resolution are used to infer electrical current pathways. The results encourage a fundamental reevaluation of transport models for network-based percolating conductors.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4916943