Bright and highly valley polarized trions in chemically doped monolayer MoS2
Bright and highly valley polarized trions in chemically doped monolayer MoS2
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DOI：
10.35848/1882-0786/ab7485
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发表时间：
2020-02
影响因子：
2.3
通讯作者：
Wenjin Zhang;Kenya Tanaka;Y. Hasegawa;K. Shinokita;K. Matsuda;Y. Miyauchi
中科院分区：
文献类型：
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作者：
Wenjin Zhang;Kenya Tanaka;Y. Hasegawa;K. Shinokita;K. Matsuda;Y. Miyauchi
我们证明了p型掺杂剂F4 TCNQ分子吸附的光致发光（PL）和谷极化特性的三离子在单层（1 L）二硫化钼在15 K下使用空间PL映射方法的效果。Trion PL强度在处理后显著增加，这归因于延长的Trion非辐射寿命（~ 70 ps）。高至0.75的Trion谷极化在化学处理后显示出可忽略的降低，这是超过纳秒量级的长trion谷寿命的表现。结果表明，这种方法将是有用的，为未来的光电谷电子学应用这些材料。
We demonstrate the effect of p-type dopant F4TCNQ molecular adsorption on the photoluminescence (PL) and valley polarization properties of trions in monolayer (1L) MoS2 at 15 K using a spatial PL mapping method. Trion PL intensity considerably increased after the treatment, which was attributed to the extended trion nonradiative lifetime (∼70 ps). Trion valley polarization as high as 0.75 showed a negligible decrease after the chemical treatment, as is the manifestation of a long trion valley lifetime of more than nanoseconds order. The results suggest that this method will be useful for future optovalleytronics applications of these materials.