1989/05/15 by Akira Morita, Taizo Sasaki, Taizô Sasaki
Materials Science · Earth and Planetary Sciences · Physics and Astronomy · #Organic and Molecular Conductors Research #High-pressure geophysics and materials #Mechanical and Optical Resonators
paper · doi:10.1143/jpsj.58.1694
A theoretical study of the electron-phonon interaction and anisotropic carrier mobilities in black phosphorus is presented. It is shown that the electron-phonon interaction is expressed in a deformation potential form in the rigid ion model and the long wave phonon approach. The deformation potential constants are calculated using the pseudopotential band theory and the lattice dynamical theory. The pressure coefficient of the energy gap estimated with the deformation potential constants is found to be in good agreement with experiment. The electron and hole mobilities are obtained by solving the Boltzmann equation. The results can explain the peculiar anisotropy of the hole and electron mobilities. Calculated mobilities at 100 K are µ x h =10.0, µ y h =3.2, µ z h =2.7, µ x e =5.8, µ y e =3.1, and µ z e =2.6×10 3 cm 2 /V·s and the corresponding observed values are 10.0, 4.0, 1.5, 6.5, 1.3, and 1.1×10 3 cm 2 /V·s, respectively.