Effect of grain size of polycrystalline diamond on its heat spreading properties

Roland B. Simon, Julian Anaya, Firooz Faili, Richard Balmer, Gruffudd T. Williams, Daniel J. Twitchen, Martin H H Kuball

Research output: Contribution to journalArticle (Academic Journal)peer-review

38 Citations (Scopus)
341 Downloads (Pure)


The exceptionally high thermal conductivity of polycrystalline diamond (∼2000Wm-1K-1) makes it a very attractive material for optimizing the thermal management of high-power devices. In this paper, the thermal conductivity of a diamond sample capturing grain size evolution from nucleation towards the growth surface is studied using an optimized 3ω technique. The thermal conductivity is found to decrease with decreasing grain size, which is in good agreement with theory. These results clearly reveal the minimum film thickness and polishing thickness from nucleation needed to achieve single-crystal diamond performance, and thus enable production of an optimal polycrystalline diamond for heat-spreading applications.

Original languageEnglish
Article number061302
Number of pages4
JournalApplied Physics Express
Issue number6
Early online date9 May 2016
Publication statusPublished - 1 Jun 2016

Structured keywords

  • CDTR


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