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Xie C, Jiang S, Gao Y, Hong M, Pan S, Zhao J, Zhang Y. Giant Thickness-Tunable Bandgap and Robust Air Stability of 2D Palladium Diselenide. Small 2020; 16:e2000754. [PMID: 32285616 DOI: 10.1002/smll.202000754] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 03/11/2020] [Accepted: 03/16/2020] [Indexed: 06/11/2023]
Abstract
Uncovering the thickness-dependent electronic property and environmental stability for 2D materials are crucial issues for promoting their applications in high-performance electronic and optoelectronic devices. Herein, the extrahigh air stability and giant tunable electronic bandgap of chemical vapor deposition (CVD)-derived few-layer PdSe2 on Au foils, by using scanning tunneling microscope/spectroscopy (STM/STS), are reported. The robust stability of 2D PdSe2 is uncovered by the observation of nearly defect/adsorption-free atomic lattices on long-time air-exposed samples. A one-to-one correspondence between the electronic bandgap (from ≈1.15 to ≈0 eV) and thickness of PdSe2 /Au (from bilayer to bulk) is established. It is also revealed that few-layer semiconducting PdSe2 flakes present zero-gap edges, induced by hybridization of Pd 4d and Se 4p orbitals. This work hereby provides straightforward evidence for the thickness-tunable electronic property and air stability of 2D semiconductors, thus shedding light on their applications in next-generation electronic devices.
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Affiliation(s)
- Chunyu Xie
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Shaolong Jiang
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Yinlu Gao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian, 116024, China
| | - Min Hong
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Shuangyuan Pan
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Jijun Zhao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian, 116024, China
| | - Yanfeng Zhang
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
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