Thermal Conduction Inhomogeneity of Nanocrystalline Diamond Films by Dual-Side Thermoreflectance

Abstract

Thin diamond films of thickness near one micrometer can have highly nonuniform thermal conductivities owing to spatially-varying disorder associated with nucleation and grain coalescence. Here we extract the nonuniformity for nanocrystalline CVD diamond films of thickness 0.5, 1.0, and 5.6 m using picosecond thermoreflectance from both the top and bottom diamond surfaces, enabled by etching a window in the silicon substrate. The thermal conductivities vary from less than 100 W m(expn -1) K(expn -1) to more than 1300 W m(expn -1) K(expn -1) and suggest that the most defective material is confined to within one micrometer of the growth surface.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2013
Accession Number
ADA577794

Entities

People

  • Bradford B. Pate
  • Elah Bozorg-grayeli
  • Karl D. Hobart
  • Kenneth E. Goodson
  • Mehdi Asheghi
  • Rajinder Sandhu
  • Tatyana I. Feygelson
  • Vincent Gambin

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Chemical Vapor Deposition
  • Coalescence
  • Conduction (Heat Transfer)
  • Conductivity
  • Diamond Films
  • Films
  • Heat Capacity
  • Heat Transfer
  • Materials
  • Measurement
  • Picosecond Time
  • Substrates
  • Thermal Conductivity
  • Thermal Properties
  • Thermal Resistance
  • Thickness
  • Thin Films

Fields of Study

  • Physics

Readers

  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Solar Photovoltaics and Thermoelectric Devices.
  • Thin Film Deposition Science.