# Phonon-limited carrier mobility in monolayer Black Phosphorous

## TL;DR

This paper investigates the electron-phonon interactions and resulting carrier mobility in monolayer black phosphorus, revealing anisotropic transport properties and field-dependent drift velocities relevant for electronic applications.

## Contribution

It provides a detailed calculation of phonon-limited mobility in monolayer black phosphorus using tight-binding and Boltzmann methods, highlighting anisotropic behavior and high-field effects.

## Key findings

- Mobility ranges from 300-1000 cm^2/Vs in armchair direction at room temperature.
- Mobility ranges from 50-120 cm^2/Vs in zig-zag direction at room temperature.
- Drift velocity reaches 10^7 cm/s at high fields in the armchair direction.

## Abstract

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 cm^2/Vs in the armchair direction and 50 - 120 cm^2/Vs in the zig-zag direction with the anisotropy due to an effective mass difference. At high fields, drift velocity is linear with electric field up to 1 - 2 V/micron reaching values of 10^7 cm/s in the armchair direction, unless self-heating effects are included.