journal article·2018-11

Chemical Vapor Deposition Grown Wafer‐Scale 2D Tantalum Diselenide with Robust Charge‐Density‐Wave Order

Jianping Shi, Xuexian Chen, Liyun Zhao, Yue Gong, Min Hong, Yahuan Huan, Zhepeng Zhang, Pengfei Yang, Yong Li, Qinghua Zhang, Qing Zhang, Lin Gu, Huanjun Chen, Jian Wang, Shaozhi Deng, Ningsheng Xu, Yanfeng Zhang

Advanced Materials· Volume 30· Issue 44
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Abstract

Abstract 2D metallic transition metal dichalcogenides (MTMDCs) are benchmark systems for uncovering the dimensionality effect on fascinating quantum physics, such as charge‐density‐wave (CDW) order, unconventional superconductivity, and magnetism, etc. However, the scalable and thickness‐tunable syntheses of such envisioned MTMDCs are still challenging. Meanwhile, the origin of CDW order at the 2D limit is controversial. Herein, the direct synthesis of wafer‐scale uniform monolayer 2H‐TaSe2 films and thickness‐tunable flakes on Au foils by chemical vapor deposition is accomplished. Based on the thickness‐tunable 2H‐TaSe2, the robust periodic lattice distortions that relate to CDW orders by low‐temperature transmission electron microscopy are directly visualized. Particularly, a phase diagram of the transition temperature from normal metallic to CDW phases with thickness by variable‐temperature Raman characterizations is established. Intriguingly, dramatically enhanced transition temperature from bulk value ≈90 to ≈125 K is observed from monolayer 2H‐TaSe2, which can be explained by the enhanced electron–phonon coupling mechanism. More importantly, an ultrahigh specific capacitance is also obtained for the as‐grown TaSe2 on carbon cloth as supercapacitor electrodes. The results hereby open up novel avenues toward the large‐scale preparation of high‐quality MTMDCs, and shed light on their applications in exploring some fundamental issues.
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Research context

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · MXene and MAX Phase Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 P. R. China

Center for Nanochemistry (CNC) Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing 100871 P. R. China

International Center for Quantum Materials School of Physics Peking University Beijing 100871 P. R. China

Collaborative Innovation Center of Quantum Matter Beijing 100871 P. R. China

State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and Technology School of Electronics and Information Technology Sun Yat‐sen University Guangzhou 510275 P. R. China

Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China

School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China

State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 P. R. China

CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 P. R. China

Funding

National Natural Science Foundation of China · China Postdoctoral Science Foundation · Chinese Academy of Sciences

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