@article{Chen2023, 
author = {Zhexue Chen and Xinyu Sui and Zhangqiang Li and Yueqi Li and Xinfeng Liu and Yong Zhang},
title = {Phase-modulated quantum-sized TMDs for extreme saturable absorption},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {4},
pages = {5803-5808},
keywords = {photoluminescence, transition metal dichalcogenides (TMDs), quantum sheets, intrinsic, nonlinear saturation absorption},
url = {https://www.sciopen.com/article/10.1007/s12274-022-5119-3},
doi = {10.1007/s12274-022-5119-3},
abstract = {Two-dimensional semiconductors such as transition metal dichalcogenides (TMDs) have attracted much interest in the past decade. Herein, we present an all-physical top-down method for the scalable production of the intrinsic TMD quantum sheets (QSs). The phases of the TMDs (e.g., 2H-MoSe2, 2H-WSe2, and Td-WTe2) remain stable during the transformation from bulk to QSs. However, phase transition (from Td to 2H) is detected in MoTe2. Such phase-modulation by size-reduction has never been reported before. The TMD QSs can be well dispersed in solvents, resulting in remarkable photoluminescence with excitation wavelength-, concentration-, and solvent-dependence. Meanwhile, the TMD QSs can be readily solution-processed into hybrid thin films, which demonstrate exceptional nonlinear saturation absorption (NSA). Notably, 2H-MoTe2 QSs in poly(methyl methacrylate) show extremely high NSA performance with (absolute) modulation depth up to 46.6% and saturation intensity down to 0.81 MW·cm−2. Our work paves the way towards quantum-sized TMDs.}
}