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Title: 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 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.
Authors:
 [1] ; ; ; ; ; ;  [1] ;  [2]
  1. Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22398865
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 14; Other Information: (c) 2015 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; 77 NANOSCIENCE AND NANOTECHNOLOGY; ELECTRIC CURRENTS; GRAPHENE; IMAGES; INDIUM FLUORIDES; JOULE HEATING; NANOWIRES; NONLINEAR PROBLEMS; RANDOMNESS; SENSORS; SILVER; SOLAR CELLS; SPATIAL RESOLUTION; TRANSISTORS; TRANSPORT THEORY