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Hot spot dynamics in carbon nanotube array devices.

Michael Engel1, Mathias Steiner, Jung-Woo T Seo

  • 1IBM Thomas J. Watson Research Center , Yorktown Heights, New York 10598, United States.

Nano Letters
|February 26, 2015
PubMed
Summary

Researchers observed localized hot spots exceeding 400 K in semiconducting carbon nanotube devices. These dynamic temperature fluctuations correlate with current variations, impacting device performance and longevity.

Keywords:
Carbon nanotubesnanoelectronicsnanoopticspower dissipationthermal imaging

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Semiconducting carbon nanotubes (CNTs) are promising for electronic devices.
  • Understanding thermal behavior is crucial for device stability and performance.
  • Previous studies lacked high-resolution insights into dynamic temperature distributions.

Purpose of the Study:

  • To investigate the dynamics of spatial temperature distributions in CNT devices.
  • To correlate thermal behavior with electrical transport properties.
  • To identify factors limiting device performance and causing degradation.

Main Methods:

  • Utilized high-resolution optical microscopy for thermal imaging.
  • Performed electrical transport measurements under steady state bias.
  • Applied time domain cross-correlation analysis to thermal radiation patterns and device current.

Main Results:

  • Observed time-variable, localized temperature maxima (hot spots) below 300 nm and above 400 K.
  • Demonstrated interdependence between electrical current fluctuations and dynamic hot spot formation.
  • Identified a correlation between thermal radiation pattern intensity fluctuations and device current.

Conclusions:

  • Dynamic hot spot formation is a critical factor affecting CNT device performance.
  • Current fluctuations are intrinsically linked to localized overheating.
  • These findings are vital for advancing carbon nanotube-based electronic technologies.