Transition metal dichalcogenides (TMDCs) over solid-state electrolytes, such as Li-glass and LaF₃, have demonstrated enhanced electronic and optoelectronic performance. However, a thorough understanding of exciton formation, recombination, and diffusion in TMDCs with solid electrolytes is still lacking. Here, we reported that monolayer WS₂ over Li-glass and LaF₃ showed a disorder-dominated exciton annihilation process and demonstrated annihilation rates of 0.033 and 0.023 cm²/s, respectively. Moreover, we found high diffusion coefficients of 278 and 88.9 cm²/s for Li-glass/WS₂ and LaF₃/WS₂, respectively, accompanied by the formation of an exciton ring in Li-glass/WS₂. We explored the factors influencing the rapid propagation of excitons and the formation of exciton rings, highlighting the significant role played by the electron–hole plasma induced by the electrical double layer at the interface. These results highlighted the crucial impact of interface disorders and electric field effects on exciton behavior in TMDCs over solid electrolytes.

中文翻译：

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在固态电解质上的单层 WS2 中实现低激子-激子湮没速率和高激子扩散系数


固态电解质（如锂玻璃和 LaF ₃ ）上的过渡金属二硫化物 （TMDC） 已显示出增强的电子和光电性能。然而，仍然缺乏对具有固体电解质的 TMDC 中激子形成、复合和扩散的透彻理解。在这里，我们报道了 Li-glass 和 LaF _{2 3} 上的单层 WS 显示出无序主导的激子湮灭过程，湮灭率分别为 0.033 和 0.023 cm ² /s。此外，我们发现 Li-glass/WS 和 LaF /WS 的扩散系数分别为 278 和 88.9 cm ² /s ₂ ，同时在 Li-glass/WS 中形成激子环 ₂ 。 _{3 2} 我们探讨了影响激子快速传播和激子环形成的因素，强调了界面处双电层诱导的电子-空穴等离子体所发挥的重要作用。这些结果强调了界面紊乱和电场效应对固体电解质上 TMDC 激子行为的关键影响。