| Title | Identifying the Non-Identical Outermost Selenium Atoms and Invariable Band Gaps across the Grain Boundary of Anisotropic Rhenium Diselenide |
| Authors | Hong, Min Zhou, Xiebo Gao, Nan Jiang, Shaolong Xie, Chunyu Zhao, Liyun Gao, Yan Zhang, Zhepeng Yang, Pengfei Shi, Yuping Zhang, Qing Liu, Zhongfan Zhao, Jijun Zhang, Yanfeng |
| Affiliation | Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China. Peking Univ, Coll Chem & Mol Engn, Beijing Sci & Engn Ctr Nanocarbons, Ctr Nanochem CNC, Beijing 100871, Peoples R China. Dalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Dalian 116024, Peoples R China. Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China. Zhang, YF (reprint author), Peking Univ, Coll Chem & Mol Engn, Beijing Sci & Engn Ctr Nanocarbons, Ctr Nanochem CNC, Beijing 100871, Peoples R China. Zhao, JJ (reprint author), Dalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Dalian 116024, Peoples R China. |
| Keywords | ReSe2 anisotropic structure scanning tunneling microscopy and spectroscopy grain boundaries electronic properties CHEMICAL-VAPOR-DEPOSITION SINGLE-LAYER MOS2 TRANSITION-METAL DICHALCOGENIDES MONOLAYER MOLYBDENUM-DISULFIDE FIELD-EFFECT TRANSISTORS AUGMENTED-WAVE METHOD ELECTRONIC-PROPERTIES ATOMICALLY THIN INPLANE ANISOTROPY FEW-LAYER |
| Issue Date | 2018 |
| Publisher | ACS NANO |
| Citation | ACS NANO. 2018, 12(10), 10095-10103. |
| Abstract | Rhenium diselenide (ReSe2) is a unique transition-metal dichalcogenide (TMDC) possessing distorted IT structure with a triclinic symmetry, strong in plane anisotropy, and promising applications in optoelectronics and energy-related fields. So far, the structural and physical properties of ReSe2 are mainly uncovered by transmission electron microscopy and spectroscopy characterizations. Herein, by combining scanning tunneling microscopy and spectroscopy (STM and STS) with first-principles calculations, we accomplish the on-site atomic scale identification of the top four non-identical Se atoms in a unit cell of the anisotropic monolayer ReSe2 on the Au substrate. According to STS and photoluminescence results, we also determine the quasiparticle and optical band gaps as well as the exciton binding energy of monolayer ReSe2. In particular, we detect a perfect lattice coherence and an invariable band gap across the mirror-symmetric grain boundaries in monolayer and bilayer ReSe2, which considerably differ from the traditional isotropic TMDCs featured with defect structures and additional states inside the band gap. Such essential findings should deepen our understanding of the intrinsic properties of two-dimensional anisotropic materials and provide fundamental references for their applications in related fields. |
| URI | http://hdl.handle.net/20.500.11897/568328 |
| ISSN | 1936-0851 |
| DOI | 10.1021/acsnano.8b04872 |
| Indexed | SCI(E) |
| Appears in Collections: | 工学院 å å¦ä¸ å å å·¥ç¨ å¦é ¢ |
