Resolidified Chalcogen Precursors for High-Quality 2D Semiconductor Growth |
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Authors: | Qinke Wu Huiyu Nong Rongxu Zheng Rongjie Zhang Jingwei Wang Liusi Yang Bilu Liu |
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Institution: | 1. Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute and Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 P. R. China
These authors contributed equally to this work.;2. Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute and Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 P. R. China;3. Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute and Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 P. R. China
Department of Physics, Capital Normal University, Beijing, 100048 P. R. China |
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Abstract: | Two-dimensional (2D) semiconductors including transition metal dichalcogenides (TMDCs) have gained attention in optoelectronics for their extraordinary properties. However, the large amount and locally distributed lattice defects affect the optical properties of 2D TMDCs, and the defects originate from unstable factors in the synthesis process. In this work, we develop a method of pre-melting and resolidification of chalcogen precursors (sulfur and selenium), namely resolidified chalcogen, as precursor for the chemical vapor deposition growth of TMDCs with ultrahigh quality and uniformity. Taking WS2 as an example, the monolayer WS2 shows uniform fluorescence intensity and a small full-width at half-maximum of photoluminescence peak at low temperatures with an average value of 13.6±1.9 meV. The defect densities at the interior and edge region are both low and comparable, i.e., (9±3)×1012 cm?2 and (10±4)×1012 cm?2, indicating its high structural quality and uniformity. This method is universal in growing high quality monolayer MoS2, WSe2, MoSe2, and will benefit their applications. |
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Keywords: | 2D Materials Defects Resolidified Sulfur Transition Metal Dichalcogenides Tungsten Disulfide |
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