Anomalous Dynamics of Defect-Assisted Phonon Recycling in Few-Layer Mo0.5W0.5S2

Wang，Xiaowei1,2; Niu，Guangming1,3; Jiang，Jutao1,2; Sui，Laizhi1; Zeng，Xiangyu1,4; Liu，Xin1,5; Zhang，Yutong1; Wu，Guorong1; Yuan，Kaijun1; Yang，Xueming1,6

2022-11-10

10.1021/acs.jpclett.2c02935

Journal of Physical Chemistry Letters   Impact Factor & Quartile

1948-7185

Alloying has emerged as a new strategy to tune the function of 2D transition metal dichalcogenides (TMDCs). However, the lack of research on the electrical and structural properties of these alloys limits their practical applications. Here, femtosecond transient absorption spectroscopy with pump pulse tunability is performed to elucidate the ultrafast carrier dynamics in the few-layer MoWSprepared by the liquid phase exfoliation method. An anomalous rebleaching of the ground state is observed at high pump fluence by 3.1 eV excitation. We ascribe this rebleaching of the ground state to the mechanism that the carriers trapped in the defect are thermally excited back to the untrapped exciton state due to the phonon recycling, which hinders the dissipation of nonradiative energy, through comparative experiments and global analysis. Our findings demonstrate a novel energy transfer channel assisted by defect in few-layer TMDCs which is critical for their advanced applications.

SCI

English

NI Journal Papers ; NI论文

Others

WOS:000879866300001

2-s2.0-85141624351

Scopus

1.State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian,457 Zhongshan Road,116023,China
2.University of the Chinese Academy of Sciences,Beijing,100039,China
3.Marine Engineering College,Dalian Maritime University,Dalian,116026,China
4.Institute of Atomic and Molecular Physics,Jilin University,Changchun,130012,China
5.Science College,Dalian Maritime University,Dalian,116026,China
6.Department of Chemistry,College of Science,Southern University of Science and Technology,Shenzhen,518055,China

Wang，Xiaowei,Niu，Guangming,Jiang，Jutao,et al. Anomalous Dynamics of Defect-Assisted Phonon Recycling in Few-Layer Mo0.5W0.5S2[J]. Journal of Physical Chemistry Letters,2022,13(44):10395-10403.

Wang，Xiaowei.,Niu，Guangming.,Jiang，Jutao.,Sui，Laizhi.,Zeng，Xiangyu.,...&Yang，Xueming.(2022).Anomalous Dynamics of Defect-Assisted Phonon Recycling in Few-Layer Mo0.5W0.5S2.Journal of Physical Chemistry Letters,13(44),10395-10403.

Wang，Xiaowei,et al."Anomalous Dynamics of Defect-Assisted Phonon Recycling in Few-Layer Mo0.5W0.5S2".Journal of Physical Chemistry Letters 13.44(2022):10395-10403.