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Super-Joule heating in graphene and silver nanowire network

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4916943· OSTI ID:22398865
 [1]; ; ; ; ;
  1. Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States)
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.
OSTI ID:
22398865
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 14 Vol. 106; ISSN APPLAB; ISSN 0003-6951
Country of Publication:
United States
Language:
English

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