Significant enhancement of exciton emission in monolayer WS2 treated by oleylamine ligands

被引：0
|
作者：
Yu, Yang [1 ,2 ]
Zhang, Xinyu [1 ,2 ]
Li, Cheng [1 ,2 ,3 ]
Han, Peigeng [3 ]
Li, Hui [1 ,2 ]
Zhao, Kun [1 ,2 ]
Lu, Ruifeng [1 ,2 ]
机构：
[1] Nanjing Univ Sci & Technol, Inst Ultrafast Opt Phys, Dept Appl Phys, Nanjing 210094, Peoples R China
[2] Nanjing Univ Sci & Technol, MIIT Key Lab Semicond Microstruct & Quantum Sensin, Nanjing 210094, Peoples R China
[3] Shandong Univ, Inst Frontier & Interdisciplinary Sci, Inst Mol Sci & Engn, Qingdao 266237, Peoples R China
来源：
APPLIED PHYSICS EXPRESS | 2023年 / 16卷 / 09期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
tungsten disulfide; exciton emission; oleylamine ligand; surface defects; TRANSITION-METAL DICHALCOGENIDES; PHOTOLUMINESCENCE ENHANCEMENT; MOS2; ELECTRONICS; EXCITATION;
D O I：
10.35848/1882-0786/acfb56
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report a significant enhancement in photoluminescence (PL) of the monolayer WS2 treated by oleylamine ligands. After oleylamine treatment, the dominant component of the PL is converted from negative trions to excitons, indicating that the majority of excitons can recombine without forming trions. This treatment enhances exciton emission by passivating surface defects, thus reducing nonradiative recombination through surface trap states. The femtosecond transient absorption spectra further confirm that defect passivation by oleylamine ligands results in a much slower recovery of exciton resonance, reflecting suppression of early-time nonradiative recombination accompanied by a significant enhancement of exciton emission.
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页数：5
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