Cooling scheme of black phosphorus-based structures via near-field radiative heat transfer

Abstract

Black phosphorus (BP) has substantially low thermal conductivity in contrast with graphene, which is a disadvantage for the heat dissipation of BP-based electronic devices. Therefore, the radiative heat transfer between BP and graphene/SiC nanowire arrays (NWAs) is studied. The dependence of heat transfer coefficient (HTC) on the electron doping of BP, filling fraction of SiC and chemical potential of graphene is comprehensively investigated. Results show that graphene/SiC NWAs with lower filling fraction perform better in transferring heat from BP sheet than that with larger filling fraction. Furthermore, the BP sheet can be tailored to two different ribbon arrays (RAs) along zigzag and armchair directions; thus, two types of BP RAs can be obtained. Hyperbolic plasmons can be supported by BP RAs, which are different from surface plasmons excited by BP sheet. The heat transfer between BP RAs and graphene/SiC NWAs is also studied. In addition to the aforementioned physical quantities, the width of BP RAs also has important effects on HTC. When the electron doping is low, large HTC of BP RAs with wide ribbons can be obtained; while when the electron doping is high, large HTC of BP RAs with narrow ribbons are obtained for both types. Obtained results in this study are useful in the cooling application of BP-based electronic devices.