Exciton Dynamics, Transport, and Annihilation in Atomically Thin Two-Dimensional Semiconductors,The Journal of Physical Chemistry Letters

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Exciton Dynamics, Transport, and Annihilation in Atomically Thin Two-Dimensional Semiconductors
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-07-11 00:00:00 , DOI: 10.1021/acs.jpclett.7b00885
Long Yuan ₁ , Ti Wang ₁ , Tong Zhu ₁ , Mingwei Zhou ₁ , Libai Huang ₁

Affiliation

Large binding energy and unique exciton fine structure make the transition metal dichalcogenides (TMDCs) an ideal platform to study exciton behaviors in two-dimensional (2D) systems. While excitons in these systems have been extensively researched, there currently lacks a consensus on mechanisms that control dynamics. In this Perspective, we discuss extrinsic and intrinsic factors in exciton dynamics, transport, and annihilation in 2D TMDCs. Intrinsically, dark and bright exciton energy splitting is likely to play a key role in modulating the dynamics. Extrinsically, defect scattering is prevalent in single-layer TMDCs, which leads to rapid picosecond decay and limits exciton transport. The exciton–exciton annihilation process in single-layer TMDCs is highly efficient, playing an important role in the nonradiative recombination rate in the high exciton density regime. Future challenges and opportunities to control exciton dynamics are discussed.

中文翻译：

原子薄二维半导体中的激子动力学，输运和An灭

大的结合能和独特的激子精细结构使过渡金属二硫代双胍（TMDC）成为研究二维（2D）系统中激子行为的理想平台。尽管对这些系统中的激子进行了广泛的研究，但目前在控制动力学的机制上尚无共识。在此透视图中，我们讨论了二维TMDC中激子动力学，输运和an灭的外在和内在因素。本质上，暗和亮激子能量分裂可能在调节动力学中起关键作用。外部而言，缺陷散射普遍存在于单层TMDC中，这导致皮秒快速衰减并限制了激子的传输。单层TMDC中的激子-激子an灭过程非常高效，在高激子密度条件下的非辐射复合率中起重要作用。讨论了控制激子动力学的未来挑战和机遇。

更新日期：2017-07-11

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