Wang Pan, Liu Hao, Zong Yixin, Wen Hongyu, Xia Jian-Bai, Wu Hai-Bin
State Key Laboratory of Superlattice and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
ACS Appl Mater Interfaces. 2021 Jul 28;13(29):34178-34187. doi: 10.1021/acsami.1c07096. Epub 2021 Jul 14.
Two-dimensional (2D) materials with excellent photocatalytic properties and unique piezoelectric response have attracted great attention. However, these characters are rare for traditional 2D structures. With an intrinsic electric field, the Janus 2D materials show great promise in photocatalytic and out-of-plane piezoelectric applications. Herein, we show that Janus InXX' (X and X' = S, Se, and Te) monolayers are desirable in the overall water splitting and piezoelectric devices. Comprehensive investigations reveal that the band gaps of these Janus monolayers are from 0.34 to 2.27 eV. With proper band edge positions, strong solar absorption, fast transfer and efficient separation of carriers, and high solar to hydrogen (STH) efficiencies (reaching 37.70%), eight members of them stand out. Besides, the electrons and holes have sufficient driving forces in the process of redox reaction. The piezoelectric response for in- and out-of-plane is superior for all monolayers. These compelling features make them suitable for photocatalysts, sensors, actuators, and energy conversion devices.
具有优异光催化性能和独特压电响应的二维（2D）材料引起了极大关注。然而，这些特性在传统二维结构中较为罕见。由于具有内建电场，Janus二维材料在光催化和面外压电应用中显示出巨大潜力。在此，我们表明Janus InXX'（X和X' = S、Se和Te）单层在全解水和压电器件中具有优势。综合研究表明，这些Janus单层的带隙为0.34至2.27 eV。其中八个成员具有合适的带边位置、强烈的太阳吸收、载流子的快速转移和有效分离以及高的太阳能制氢（STH）效率（达到37.70%）。此外，电子和空穴在氧化还原反应过程中具有足够的驱动力。所有单层的面内和面外压电响应都很优异。这些引人注目的特性使其适用于光催化剂、传感器、致动器和能量转换器件。
