title: Two-dimensional BX (X = P, As, Sb) semiconductors with mobilities approaching graphene.
abstract: Carrier mobility plays a key role in the performance of microelectronic devices, especially the field effect transistors (FET). To design next generation two-dimensional (2D) FET, stable channel materials with a higher carrier mobility than silicon and a significant band gap are highly desirable, but are still not discovered. Here, we report a group of 2D materials of BX (X = P, As, and Sb), which are semiconducting with an ultrahigh carrier mobility. Using first-principles calculations, we find that all BX configurations are similar to graphene, but possess direct bandgaps of 1.36, 1.14, and 0.49 eV, respectively. Based on deformation potential theory, BX monolayers are predicted to have superior mobilities (>10(4) cm(2) V(-1) s(-1)) to phosphorene. In particular, the electron mobility of monolayer BSb is 3.2 × 10(5) cm(2) V(-1) s(-1), approaching the figure of merit in graphene (∼3 × 10(5) cm(2) V(-1) s(-1)). These results demonstrate that BX monolayers are of paramount significance for next-generation 2D FET manufacture.
authors.affiliation: Institute of Optoelectronics and Nanomaterials, Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. zeng.haibo@njust.edu.cn.
authors.forename: Meiqiu
authors.initials: M
authors.lastname: Xie
authors.forename: Shengli
authors.initials: S
authors.lastname: Zhang
authors.forename: Bo
authors.initials: B
authors.lastname: Cai
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zhu
authors.forename: Yousheng
authors.initials: Y
authors.lastname: Zou
authors.forename: Haibo
authors.initials: H
authors.lastname: Zeng