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Trap-free exciton dynamics in monolayer WS2 via oleic acid passivation
Nanoscale ( IF 5.8 ) Pub Date : 2021-11-22 , DOI: 10.1039/d1nr05590a
Dabin Lin 1 , Wenjun Ni 2 , Gagik G Gurzadyan 2 , Fangteng Zhang 1 , Weiren Zhao 1, 3 , Lin Ma 1, 3 , Zhaogang Nie 1, 3
Affiliation  

Two-dimensional transition metal dichalcogenides have attracted a great deal of attention in the past few decades owing to their attractive optoelectronic properties. However, their widespread utility in photonic devices and components is still limited owing to their weak photoluminescence. While various treating methods are in place to improve the photoluminescence yield, the impact of these treatments on the excited state (especially exciton) dynamics in these two-dimensional materials remains ill defined. In this work, exciton dynamics in pristine and oleic acid-treated monolayer WS2 were comprehensively studied through various ultrafast experimental techniques. We demonstrate that oleic acid effectively passivates the defect states in as-fabricated WS2, resulting in trap-free exciton dynamics and exciton annihilation rate reduction, which leads to stronger steady-state photoluminescence and longer photoluminescence lifetime. These results provide valuable information on the intrinsic exciton dynamics in monolayer WS2, which could also be applicable in other two-dimensional transition metal dichalcogenides and help improve optoelectronic device performance.

中文翻译:

通过油酸钝化在单层 WS2 中的无陷阱激子动力学

在过去的几十年中,二维过渡金属二硫属化物由于其有吸引力的光电特性而引起了极大的关注。然而,由于它们的光致发光较弱,它们在光子器件和组件中的广泛应用仍然受到限制。虽然有各种处理方法来提高光致发光产率,但这些处理对这些二维材料中激发态(尤其是激子)动力学的影响仍然不明确。在这项工作中,通过各种超快实验技术全面研究了原始和油酸处理的单层 WS 2中的激子动力学。我们证明油酸有效地钝化了所制造的 WS 2 中的缺陷状态,导致无陷阱激子动力学和激子湮灭率降低,从而导致更强的稳态光致发光和更长的光致发光寿命。这些结果提供了关于单层 WS 2 中本征激子动力学的宝贵信息,这也可适用于其他二维过渡金属二硫属化物,并有助于提高光电器件的性能。
更新日期:2021-11-30
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