Anisotropic thermoelectric power factor in phosphorene

Low temperature anistropic thermoelectric power factor (PF) of single layer black phosphorus is investigated. Charge carriers assumed to be scattered by in-plane and out-of-plane phonons via deformation potential coupling. Theoretical investigations (PF) including anisotropic electronic dispersion relation show single in-plane phonon scattering process is dominant over the range of temperature and carrier concentrations considered. Numerical calculations of PF showcase role and relative importance of in-plane and out-of-plane phonon scattering mechanisms operative in the system.