Research Article

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2020, 13(3): 667–675

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https://doi.org/10.1007/s12274-020-2673-4

Salt-assisted growth and ultrafast photocarrier dynamics of largesized monolayer ReSe2

Shaolong Jiang1,§ (*), Jin Yang2,3,§, Yuping Shi1, Jing Zhao2,3, Chunyu Xie1, Liyun Zhao1, Jiatian Fu1, Pengfei Yang1, Yahuan Huan1, Qin Xie4, Huachao Jiang2, Qing Zhang1, Xianlong Wang2, Fuhai Su2 (*), and Yanfeng Zhang1

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1 Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
2 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
3 University of Science and Technology of China, Hefei 230026, China
4 Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
§ Shaolong Jiang and Jin Yang contributed equally to this work.

Keywords: ReSe2, chemical vapor deposition, sodium chloride, large size, ultrafast photocarrier dynamics
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  • Abstract
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Owing to its anisotropic optical and electrical properties, rhenium diselenide (ReSe2) has garnered considerable attention recently as a candidate material for polarization-sensitive photodetectors. However, the direct and controllable synthesis of large-sized ReSe2 with a uniform thickness is still a great challenge. Herein, we have refined the synthesis method to obtain uniform monolayer ReSe2 flakes with a size of up to ~ 106 μm on sapphire via an ambient-pressure chemical vapor deposition technique using Na promoter from sodium chloride. Interestingly, optical pump-probe spectroscopy revealed a fast switching from saturable absorption (SA) to absorption enhancement (AE) in subpicosecond time scale, followed by a slower decay induced by exciton recombination. Furthermore, both AE and SA signals exhibited clear angular dependence with a periodicity of 180°, which reflected the dichroism in nonlinear absorption dynamics. In addition, the photocarrier dynamics including free-carrier transport and subpicosecond relaxation due to exciton formation or surface trapping was probed using time resolved terahertz spectroscopy. We believe that our study serves as a reference for atomically controlled synthesis of large-sized ReSe2 and provides useful insights on its optoelectronic properties for novel device applications.
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Salt-assisted growth and ultrafast photocarrier dynamics of largesized monolayer ReSe2. Nano Res. 2020, 13(3): 667–675 https://doi.org/10.1007/s12274-020-2673-4

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