Premium
High Thermal Conductivity in Isotopically Enriched Cubic Boron Phosphide
Author(s) -
Zheng Qiye,
Li Sheng,
Li Chunhua,
Lv Yinchuan,
Liu Xiaoyuan,
Huang Pinshane Y.,
Broido David A.,
Lv Bing,
Cahill David G.
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201805116
Subject(s) - materials science , raman spectroscopy , analytical chemistry (journal) , phosphide , boron nitride , boron , diamond , microelectronics , thermal conductivity , optoelectronics , nanotechnology , metallurgy , optics , metal , composite material , chemistry , physics , organic chemistry , chromatography
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 11 BP 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 11 BP 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 11 BP 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.