2016/05/14 by Zhenghe Jin, Jeffrey T. Mullen, Ki Wook Kim · 38 citations
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Anisotropy #Bilayer #Density functional theory #Electron #Electron mobility #Monolayer #Nanowire Synthesis and Applications #Phosphorene #Thermal properties of materials #Zigzag #cond-mat.mes-hall
paper · pdf · doi:10.1063/1.4960526
published in Applied Physics Letters 109(5) (American Institute of Physics)
arxiv created 2016/05/14 · openalex created_date 2016/06/24 · openalex publication_date 2016/08/01 · arxiv updated 2016/08/24 · openalex updated_date 2026/08/05
The intrinsic carrier transport dynamics in phosphorene is theoretically examined. Utilizing a density functional theory treatment, the low-field mobility and the saturation velocity are characterized for both electrons and holes in the monolayer and bilayer structures. The analysis clearly elucidates the crystal orientation dependence manifested through the anisotropic band structure and the carrier-phonon scattering rates. In the monolayer, the hole mobility in the armchair direction is estimated to be approximately five times larger than in the zigzag direction at room temperature (460 cm2/V s vs. 90 cm2/V s). The bilayer transport, on the other hand, exhibits a more modest anisotropy with substantially higher mobilities (1610 cm2/V s and 760 cm2/V s, respectively). The calculations on the conduction-band electrons indicate a comparable dependence while the characteristic values are generally smaller by about a factor of two. The variation in the saturation velocity is found to be less pronounced. With the anticipated superior performance and the diminished anisotropy, few-layer phosphorene offers a promising opportunity particularly in p-type applications.