大面积3R相WS2和WSe2原子层的受控蒸汽生长和非线性光学应用,Advanced Functional Materials

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大面积3R相WS2和WSe2原子层的受控蒸汽生长和非线性光学应用
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-01-28 , DOI: 10.1002/adfm.201806874
Zhouxiaosong Zeng ₁ , Xingxia Sun ₂ , Danliang Zhang ₁ , Weihao Zheng ₁ , Xiaopeng Fan ₂ , Mai He ₁ , Tao Xu ₃ , Litao Sun ₃ , Xiao Wang ₁ , Anlian Pan ₂

Affiliation

由于2D层状3菱面体（3R）相变金属二卤化金属（TMD）具有独特的晶体结构和反对称性，因此在非线性光学应用中的研究兴趣大大提高。然而，2D 3R阶段TMD的受控增长仍然是一个巨大的挑战。在这项工作中，大面积WS ₂和WSe ₂的直接增长据报道，通过发展的温度选择性物理气相沉积途径，具有可控晶相的原子层。大面积的三角形3R相层是在较低的沉积温度下合成的。稳态和时间分辨光致发光光谱和拉曼光谱用于研究3R相层的独特性质，这是由于不同的层堆叠和层间耦合引起的。更重要的是，由于反转对称性受到破坏，3R相层相对于层数显示出二次增加的二次谐波生成（SHG）强度。此外，通过偏振分辨的SHG，在双层和三层3R相位WS _2中观察到均匀的偏振优先性，这对于实际应用可能是有益的。结果不仅有助于具有不同相位的2D TMDs层的受控生长，而且还为有前途的非线性光学器件铺平了道路。

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Controlled Vapor Growth and Nonlinear Optical Applications of Large‐Area 3R Phase WS2 and WSe2 Atomic Layers

2D layered 3‐rhombohedral (3R) phase transition metal dichalcogenides (TMDs) have received significantly increased research interest in nonlinear optical applications due to their unique crystal structures and broken inversion symmetry. However, controlled growth of 2D 3R phase TMDs still remains a great challenge. In this work, a direct growth of large‐area WS₂ and WSe₂ atomic layers with controllable crystal phases via a developed temperature selective physical vapor deposition route is reported. Large‐area triangular 3R phase layers are synthesized at a lower deposition temperature. Steady state and time‐resolved photoluminescence spectroscopy and Raman spectroscopy are used to study the unique properties of 3R phase layers due to different layer stacking and interlayer coupling. More importantly, with broken inversion symmetry, 3R phase layers show a quadratically increased second harmonic generation (SHG) intensity with respect to layer numbers. Furthermore, by polarization‐resolved SHG, a uniform polarization preference is observed in bilayer and trilayer 3R phase WS₂, which could be a benefit for practical applications. The results not only contribute to the controlled growth of 2D TMDs layers with different phases but also pave the way to promising nonlinear optical devices.

更新日期：2019-01-28

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