Exceptional and Anisotropic Transport Properties of Photocarriers in Black Phosphorus

TL;DR

Black phosphorus exhibits exceptionally high, anisotropic charge mobility and long photocarrier lifetime at room temperature, making it highly promising for advanced electronic and optoelectronic devices.

Contribution

This study reveals the high mobility, strong anisotropy, and long photocarrier lifetime of black phosphorus at room temperature, highlighting its potential for future applications.

Findings

Charge mobility of ~10^4 cm^2V^{-1}s^{-1} at room temperature

Mobility anisotropy with armchair direction superior to zigzag

Photocarrier lifetime up to 100 ps

Abstract

We show that black phosphorus has room-temperature charge mobilities on the order of 10$^4$ cm$^2$V$^{-1}$s$^{-1}$, which are about one order of magnitude larger than silicon. We also demonstrate strong anisotropic transport in black phosphorus, where the mobilities along the armchair direction are about one order of magnitude larger than zigzag direction. A photocarrier lifetime as long as 100 ps is also determined. These results illustrate that black phosphorus is a promising candidate for future electronic and optoelectronic applications.