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超快速电荷转移和重组动力学在单层-多层WSe₂连接中通过时间分辨率光辐射电子显微镜揭示了

Ce Xu¹, Natalie Barden¹, Evgeny M Alexeev²

¹School of Chemistry, Chemical Engineering and Biotechnology, and School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.

|January 10, 2024

概括

超快速的孔转移发生在化学上相同的WSe2连接处. 这种电荷转移和再组合会影响层级材料中的载体动力学,为二维电子提供新的见解.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
物理化学物理化学

背景情况:

了解过渡金属二甲基化物 (TMD) 结合处的超快载体动态至关重要.
化学上相同但电子上不同的TMD呈现出独特的界面现象.
单层到多层 (1L-ML) WSe2 连接在去皮样本中很常见.

研究的目的:

为了研究1L-ML WSe2连接处的超快载体动态.
阐明这些接口上的电荷转移和重组机制.
将实验结果与理论预测进行比较.

主要方法:

使用时间分辨率光发射电子显微镜 (TR-PEEM).
进行了ab initio量子动力学模拟.
分析了载体冷却,激子-激子灭绝和界面电荷转移.

主要成果:

在1L-和7L-WSe2中观察到低于图秒的载体冷却.
在1L-WSe2.2.上检测到几比秒钟的激发-激发灭绝.
超快速的界面孔转移从1L-到7L-WSe2在~0.2 ps的时间尺度上.
在 ~100 ps 时间尺度上在接口上重新组合孔.
在7L-WSe2接口的孔密度积累,衰变长度为~0.60 ± 0.17μm.

结论:

实验结果与初始量子力学一致.
电荷转移发生在ML区域的基底平面到上层平面之间.
这种独特的电荷传输路径影响着 ML 区域相邻的 1L-TMD 中的载波失活.

关键词:

接口电荷转移交互器侧面交叉点侧面交叉点非adiabatic ab initio 分子动力学分子动力学时间分辨率光辐射电子显微镜.过渡金属二甲基二甲基化物超快光谱法是指超快的光谱法.

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