High Thermal Conductivity in Isotopically Enriched Cubic Boron Phosphide
Abstract
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 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 05, 2018
- Source ID
- 10.1002/adfm.201805116
Entities
People
- Bing Lv
- Chunhua Li
- David A. Broido
- David G. Cahill
- Pinshane Huang
- Qiye Zheng
- Sheng Li
- Xiaoyuan Liu
- Yinchuan Lv
Organizations
- Air Force Office of Scientific Research
- Boston College
- Office of Naval Research
- University of Illinois Urbana–Champaign
- University of Texas at Dallas