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Atypical Defect-Mediated Photoluminescence and Resonance Raman Spectroscopy of Monolayer WS2
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-02-04 , DOI: 10.1021/acs.jpcc.8b11647 Jiake Li , Weitao Su , Fei Chen , Li Fu , Su Ding , Kaixin Song , Xiwei Huang , Lijie Zhang 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-02-04 , DOI: 10.1021/acs.jpcc.8b11647 Jiake Li , Weitao Su , Fei Chen , Li Fu , Su Ding , Kaixin Song , Xiwei Huang , Lijie Zhang 1
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Defects play an indispensable role in tuning the optical properties of two-dimensional materials. Herein, we study the influence of defects on the photoluminescence and resonance Raman spectra of as-grown monolayer (1L) WS2. Increasing the density of defects significantly lowers the excitonic binding energy by up to 110 meV. These defect-modified excitonic binding energies in 1L-WS2 strongly mediate the Raman resonance condition, resulting in unexpected Raman intensity variations in the LA(M), 2LA(M), and A1′(Γ) phonon modes. The sample with the highest density of defects exhibits an almost temperature-independent resonance in different Raman modes at low temperature, whereas the samples with low densities of defects exhibit a clear resonance with decreasing temperature. This study will further increase our understanding of the role of defects in resonance Raman spectroscopy and of the phonon–exciton interaction in 1L-WS2.
中文翻译：
单层WS 2的非典型缺陷介导的光致发光和共振拉曼光谱。
缺陷在调整二维材料的光学特性中起着不可或缺的作用。在这里，我们研究缺陷对生长的单层（1L）WS 2的光致发光和共振拉曼光谱的影响。增加缺陷的密度会显着降低激子结合能达110 meV。1L-WS 2中这些缺陷修饰的激子结合能强烈介导拉曼共振条件，导致LA（M），2LA（M）和A 1 '中的拉曼强度发生意外变化（Γ）声子模式。缺陷密度最高的样品在低温下在不同的拉曼模式下表现出几乎与温度无关的共振，而缺陷密度低的样品随温度降低而表现出明显的共振。这项研究将进一步加深我们对共振拉曼光谱中缺陷的作用以及1L-WS 2中声子-激子相互作用的认识。
更新日期：2019-02-06
中文翻译：
单层WS 2的非典型缺陷介导的光致发光和共振拉曼光谱。
缺陷在调整二维材料的光学特性中起着不可或缺的作用。在这里，我们研究缺陷对生长的单层（1L）WS 2的光致发光和共振拉曼光谱的影响。增加缺陷的密度会显着降低激子结合能达110 meV。1L-WS 2中这些缺陷修饰的激子结合能强烈介导拉曼共振条件，导致LA（M），2LA（M）和A 1 '中的拉曼强度发生意外变化（Γ）声子模式。缺陷密度最高的样品在低温下在不同的拉曼模式下表现出几乎与温度无关的共振，而缺陷密度低的样品随温度降低而表现出明显的共振。这项研究将进一步加深我们对共振拉曼光谱中缺陷的作用以及1L-WS 2中声子-激子相互作用的认识。
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