Phonon-limited carrier mobility in monolayer black phosphorus

We calculate an electron-phonon scattering and intrinsic transport properties of black phosphorus monolayer using tight-binding and Boltzmann treatments as a function of temperature, carrier density, and electric field. The low-field mobility shows weak dependence on density and, at room temperature, falls in the range of 300-1000 cm2/Vs in the armchair direction and 50-120cm2/Vs in the zigzag direction with an anisotropy due to the effective mass difference. At high fields, drift velocity is linear with field up to 1-2 V/μm reaching values of 107 cm/s in the armchair direction, unless self-heating effects are included.