title: Exceptional and Anisotropic Transport Properties of Photocarriers in Black Phosphorus.
abstract: One key challenge in developing postsilicon electronic technology is to find ultrathin channel materials with high charge mobilities and sizable energy band gaps. Graphene can offer extremely high charge mobilities; however, the lack of a band gap presents a significant barrier. Transition metal dichalcogenides possess sizable and thickness-tunable band gaps; however, their charge mobilities are relatively low. Here 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 1 order of magnitude larger than silicon. We also demonstrate strong anisotropic transport in black phosphorus, where the mobilities along the armchair direction are about 1 order of magnitude larger than in the 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.
authors.affiliation: †Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China.|‡Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, United States.
authors.forename: Jiaqi
authors.initials: J
authors.lastname: He
authors.affiliation: †Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China.
authors.forename: Dawei
authors.initials: D
authors.lastname: He
authors.affiliation: †Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China.
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Wang
authors.affiliation: ‡Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, United States.
authors.forename: Qiannan
authors.initials: Q
authors.lastname: Cui
authors.affiliation: ‡Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, United States.
authors.forename: Matthew Z
authors.initials: MZ
authors.lastname: Bellus
authors.affiliation: ‡Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, United States.
authors.forename: Hsin-Ying
authors.initials: HY
authors.lastname: Chiu
authors.affiliation: ‡Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, United States.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhao
keywords: black phosphorus; carrier lifetime; charge transport; transient absorption