High thermal conductivity in covalently bonded bi-layer honeycomb boron arsenide

Semiconducting materials with high thermal conductivity are valuable for management in highly integrated systems, which heat must be dissipated efficiently. Cubic boron arsenide (BAs) is recently attracting numerous research attention due to its comparable diamond. However, of monolayer honeycomb BAs much lower than the bulk counterpart. Herein, based on Boltzmann transport equation and non-equilibrium Green’s function calculation, we suggest a new unexplored covalently bonded bi-layer exhibit conductivity, about two times that silicon. Unlike remarkable reduction from graphene graphene, 70% higher Central this novel behavior was largely suppressed phonon scattering phase space anharmonicity. The anomalously emergent underlying mechanism discussed here open up further manipulation properties 2D materials, facilitate their applications important problems nanoscale electronic optoelectronic devices.