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Chen, Ke; Song, Bai; Ravichandran, Navaneetha K; Zheng, Qiye; Chen, Xi; Lee, Hwijong; Sun, Haoran; Li, Sheng; Udalamatta Gamage, Geethal Amila Gamage; Tian, Fei; Ding, Zhiwei; Song, Qichen; Rai, Akash; Wu, Hanlin; Koirala, Pawan; Schmidt, Aaron J; Watanabe, Kenji; Lv, Bing; Ren, Zhifeng; Shi, Li; Cahill, David G; Taniguchi, Takashi; Broido, David; Chen, Gang
Science (American Association for the Advancement of Science), 01/2020, Volume: 367, Issue: 6477Journal Article
Materials with high thermal conductivity (κ) are of technological importance and fundamental interest. We grew cubic boron nitride (cBN) crystals with controlled abundance of boron isotopes and measured κ greater than 1600 watts per meter-kelvin at room temperature in samples with enriched B or B. In comparison, we found that the isotope enhancement of κ is considerably lower for boron phosphide and boron arsenide as the identical isotopic mass disorder becomes increasingly invisible to phonons. The ultrahigh κ in conjunction with its wide bandgap (6.2 electron volts) makes cBN a promising material for microelectronics thermal management, high-power electronics, and optoelectronics applications.
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