分子包装要求在有机/2D半导体接口上对光子上转换进行一阶段或两阶段三倍感应
Min Xu1, Cheng Sun1, Guoyu Xiang1
1State Key Laboratory of Extreme Photonics and Instrumentation, Zhejiang Key Laboratory of Excited-State Energy Conversion and Energy Storage, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310058, China.
ACS nano
|October 11, 2025
概括
在有机/2D半导体异构结构中的分子包装对近红外光子上转换产生了关键影响. 不同的包装结构决定了不同的三倍感应路径,影响了光电子应用的效率.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 2D 半导体 2D 半导体
背景情况:
- 通过三倍三倍灭绝 (TTA) 实现近红外 (NIR) 光子向上转换对于光采集和光电子学至关重要.
- 了解有机/2D半导体接口的三重敏感化机制至关重要,但尚未得到充分研究.
- 分子包装对这些过程的影响仍然在很大程度上是未知的.
研究的目的:
- 为了研究分子包装在烯/WSe2异构结构在NIR到可见光子上升转换中的作用.
- 阐明不同rubrene阶段 (orthorhombic,单临床,无形) 影响的三重敏感化机制和动态.
- 为优化固态光子上转换建立设计原则.
主要方法:
- 烯/WSe2异构结构的制造和表征,具有不同的烯相.
- 超快速光谱检测三重敏感化动态.
- 紫外光电子光谱 (UPS) 和光学测量以分析接口电子结构.
主要成果:
- 从NIR到可见光子的上升转换在正方体 (Orth) 和单临床 (Mono) rubrene/WSe2异构结构中都被观察到.
- 正向的异构结构表现出两步间接的电荷转移介导的三倍感应 (5.3 psi孔转移,67 ps电子转移) 与86%的三倍能量转移 (TET) 量子收益率.
- 单个异构结构显示了一步直接的德克斯特能量传输机制,速度较慢 (20 ps) 和47%的TET量子产量.
- 界面带对齐,特别是最高占有分子轨道 (HOMO) 水平,是由分子 π 堆叠和分子间合调节的,影响了敏感化途径.
结论:
- 分子包装是一个关键的,被忽视的因素,它决定了有机/2D半导体接口的三重敏感化路径和效率.
- 不同的rubrene相导致不同的界面电子结构,因此,不同的光子上转换机制.
- 这项研究为开发高效的固态光子上转换装置提供了基本的见解和设计指南.
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