High Thermal Conductivity in Isotopically Enriched Cubic Boron Phosphide



Zinc blende boron arsenide (BAs), boron phosphide (BP), and boron nitride (BN) have attracted significant interest in recent years due to their high thermal conductivity (Λ) predicted by first-principles calculations. This research reports the study of the temperature dependence of Λ (120 K < T < 600 K) for natural isotope-abundance BP and isotopically enriched 11BP crystals grown from modified flux reactions. Time-domain thermoreflectance is used to measure Λ of sub-millimeter-sized crystals. At room temperature, Λ for BP and 11BP is 490 and 540 W m−1 K−1, respectively, surpassing the values of conventional high Λ materials such as Ag, Cu, BeO, and SiC. The Λ of BP is smaller than only cubic BN, diamond, graphite, and BAs among single-phase materials. The measured Λ for BP and 11BP is in good agreement with the first-principles calculations above 250 K. The quality of the crystals is verified by Raman spectroscopy, X-ray diffraction, and scanning transmission electron microscopy. By combining the first-principles calculations and Raman measurements, a previously misinterpreted Raman mode is reassigned. Thus, BP is a promising material not only for heat spreader applications in high-power microelectronic devices but also as an electronic material for use in harsh environments. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


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Isotope separation, Raman spectroscopy, Time-domain analysis, Arsenic compounds, Beryllium oxide, High resolution electron microscopy, Isotopes, Microelectronics, Scanning electron microscopy, Silicon carbide, Silicon compounds, Thermal conductivity, Insulation (Heat), Transmission electron microscopy, Zinc sulfide, Single-phase materials


Office of Naval Research MURI. Grant Number: N00014‐16‐1‐2436; US Air Force Office of Scientific Research. Grant Number: FA9550‐15‐1‐0236.


©2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim