Ultrahigh thermal conductivity in isotope-enriched cubic boron nitride
A cool way to use isotopes
Thermal management of electronics requires materials that can efficiently remove heat. Several promising materials have been found recently, but diamond remains the bulk material with the highest thermal conductivity. Chen et al. found that isotopically pure cubic boron nitride has an ultrahigh thermal conductivity, 75% that of diamond. Using only boron-11 or boron-10 allows the crystal vibrations that carry heat to move more efficiently through the material. This property could be exploited for better regulating the temperature of high-power devices.
AbstractMaterials 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 10B or 11B. 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.
- 2020-09-24 > Wafer-scale single-crystal hexagonal boron nitride monolayers on Cu (111)
- 2020-09-24 > Hexagonal Boron Nitride as a Multifunctional Support for Engineering Efficient Electrocatalysts toward the Oxygen Reduction Reaction
- 2020-08-21 > Boron nitride nanotubes and nanosheets
- 2020-08-21 > A comprehensive analysis of the CVD growth of boron nitride nanotubes
- 2020-06-13 > One-dimensional hexagonal boron nitride conducting channel
- 2020-06-13 > Metal-Free Modified Boron Nitride for Enhanced CO2 Capture
- 2020-06-13 > Functionalizations of boron nitride nanostructures
- 2020-06-13 > Engineering spin defects in hexagonal boron nitride
- 2020-06-13 > Grain Dependent Growth of Bright Quantum Emitters in Hexagonal Boron Nitride
- 2020-06-13 > Process for manufacturing boron nitride agglomerates