三极管
谱线
单层
光子学
材料科学
分子物理学
吸收光谱法
过渡金属
吸收(声学)
化学
化学物理
凝聚态物理
光电子学
物理
纳米技术
光学
量子力学
生物化学
复合材料
催化作用
作者
Thomas Sayer,Yusef Farah,Rachelle Austin,Justin B. Sambur,Amber T. Krummel,Andrés Montoya−Castillo
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-06-13
卷期号:23 (13): 6035-6041
被引量:2
标识
DOI:10.1021/acs.nanolett.3c01342
摘要
Monolayer transition-metal dichalcogenides (ML-TMDs) have the potential to unlock novel photonic and chemical technologies if their optoelectronic properties can be understood and controlled. Yet, recent work has offered contradictory explanations for how TMD absorption spectra change with carrier concentration, fluence, and time. Here, we test our hypothesis that the large broadening and shifting of the strong band-edge features observed in optical spectra arise from the formation of negative trions. We do this by fitting an ab initio based, many-body model to our experimental electrochemical data. Our approach provides an excellent, global description of the potential-dependent linear absorption data. We further leverage our model to demonstrate that trion formation explains the nonmonotonic potential dependence of the transient absorption spectra, including through photoinduced derivative line shapes for the trion peak. Our results motivate the continued development of theoretical methods to describe cutting-edge experiments in a physically transparent way.
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