Super-Joule heating in graphene and silver nanowire network
- Purdue Univ., West Lafayette, IN (United States)
Transistors, sensors, and transparent conductors based on randomly assembled nanowire networks lean on multi-component percolation for unique and distinctive applications in flexible electronics, biochemical sensing, and solar cells. Although 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 findings encourage a fundamental reevaluation of transport models for network-based percolating conductors.
- Research Organization:
- Univ. of California, Santa Barbara, CA (United States). Energy Frontier Research Center (EFRC) Center for Energy Efficient Materials (CEEM); Columbia Univ., New York, NY (United States). Energy Frontier Research Center (EFRC) Re-Defining Photovoltaic Efficiency Through Molecule Scale Control (RPEMSC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- SC0001009; SC0001085
- OSTI ID:
- 1369777
- Alternate ID(s):
- OSTI ID: 1226734
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 14; Related Information: CEEM partners with the University of California, Santa Barbara (lead); Purdue University; Los Alamos National Laboratory; National Renewable Energy Laboratory; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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