文献类型： 外文期刊
第一作者： Qu, Jiafan
作者： Qu, Jiafan;Zhao, Liang;Tan, Ruoxi;Shi, Hongyan;Gao, Bo;Wei, Yadong;Yang, Jianqun;Li, Xingji;Li, Weiqi;Shi, Hongyan;Gao, Bo;Zhang, Yueling
作者机构：
关键词： exciton localization; excitonrelaxation; defect; monolayer MoS2; C exciton
期刊名称：ACS NANO （ 影响因子：16.0； 五年影响因子：16.4 ）
ISSN： 1936-0851
年卷期： 2024 年 18 卷 50 期
页码：
收录情况： SCI
摘要： Defects in chemical vapor deposition (CVD)-grown monolayer MoS2 are unavoidable and provide a powerful approach to creating single-photon emitters and quantum information systems through localizing excitons. However, insight into the A(-) trion and B/C exciton localization in monolayer MoS2 remains elusive. Here, we investigate defect-mediated A(-) trion and B/C exciton localization and relaxation in CVD-grown monolayer MoS2 samples via transient absorption spectroscopy. The localization rate of A(-) trions is five times faster than B excitons, which is attributed to the distinctions in the Bohr radius, diffusion rate, and multiphonon emission. Furthermore, we obtain unambiguous experimental evidence for the direct excitation of localized C excitons. Varying gap energy at the band-nesting region revealed by first-principles calculations explains the anomalous dependence of localized C exciton energy on delay time. We also find that the rapid dissociation of localized C excitons features a short characteristic time of similar to 0.14 ps, while the measured relaxation time is much longer. Our results provide a comprehensive picture of the defect-mediated excitonic relaxation and localization dynamics in monolayer MoS2.
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