Exciton Emissions in Bilayer WSe2 Tuned by the Ferroelectric Polymer.
Exciton Emissions in Bilayer WSe2 Tuned by the Ferroelectric Polymer.
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DOI：
10.1021/acs.jpclett.1c04029
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
Sixin Zhu;Dan Li;Qiang Wang;Zirui He;Yongpeng Wu;Huihong Lin;Longbo Huang;Hai Huang;
中科院分区：
文献类型：
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作者：
Sixin Zhu;Dan Li;Qiang Wang;Zirui He;Yongpeng Wu;Huihong Lin;Longbo Huang;Hai Huang;
在这项工作中，设计了多层过渡金属二硫属化物（TMD）和铁电聚合物的混合结构，以实现原位光学特性的被动控制。铁电聚(偏二氟乙烯-三氟乙烯) (P(VDF-TrFE)) 聚合物中的电极化可以调节双层 WSe2 中的光致发光 (PL)。在双层 WSe2 中大栅极电压下，总 PL 发射强度得到显着抑制或增强。这是因为电子通过P(VDF-TrFE)聚合物中的静电场在导带K谷和导带Λ谷之间转移。这种电子转移进一步调整直接和间接激子的比例，进而改变整体光辐射效率。我们还说明，工程化的 PL 源于外部电场依赖的转移电子效应。理论结果与实验数据吻合良好。这项工作展示了一个器件平台，其中使用由极化铁电材料调制的 2D TMD 来实现无源调节。
In this work, a hybrid structure of multilayer transition-metal dichalcogenides (TMDs) and a ferroelectric polymer is designed to achieve passive control of optical properties in situ. The electrical polarization in the ferroelectric poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) polymer can regulate the photoluminescence (PL) in bilayer WSe2. The total PL emission intensity is substantially suppressed or enhanced under large gate voltage in bilayer WSe2. This is because electrons transfer between the conduction band K valley and the conduction band Λ valley by the electrostatic field in the P(VDF-TrFE) polymer. This electron transfer further adjusts the proportion of direct and indirect excitons and, in turn, changes the overall optical radiation efficiency. We also illustrate that the engineered PL originates from the external electric-field-dependent transferred electron effect. The theoretical result matches the experimental data well. This work demonstrates a device platform in which passive regulation is achieved using 2D TMDs modulated by polarized ferroelectric materials.