Scalable preparation of water-soluble ink of few-layered WSe2 nanosheets for large-area electronics
Scalable preparation of water-soluble ink of few-layered WSe2 nanosheets for large-area electronics
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用于大面积电子器件的多层WSe2纳米片水溶性墨水的可扩展制备
DOI：
10.1088/1674-1056/ab889e
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发表时间：
2020
影响因子：
1.7
通讯作者：
Yang Haitao
中科院分区：
文献类型：
--
作者：
Xian Guoyu;Zhang Jianshuo;Liu Li;Zhou Jun;Liu Hongtao;Bao Lihong;Shen Chengmin;Li Yongfeng;Qin Zhihui;Yang Haitao
具有层相关带隙的少层二维（2D）半导体纳米片是大面积薄膜电子学的有吸引力的构建块。提出了一种大规模快速制备均匀且相纯的2H-WSe 2半导体纳米片的通用方法，该方法涉及超临界二氧化碳（SC-CO 2）处理和水溶液中温和的超声辅助剥离过程。通过拉曼光谱（Raman）、x射线光电子能谱（XPS）和扫描透射电子显微镜（STEM）证实，制备的2h - wse2纳米片保持了其固有的物理性质和完整的晶体结构。均匀的2h - wse2纳米片可以在水中分散6个多月。这种良好的分散性和均匀性使这些纳米片能够自组装成厚度可控的薄膜，用于大规模制造薄膜电子器件阵列。本文还研究了自组装2h - wse2薄膜的场效应晶体管的电子输运和光电子性质。(纸)
Few-layer two-dimensional (2D) semiconductor nanosheets with a layer-dependent band gap are attractive building blocks for large-area thin-film electronics. A general approach is developed to fast prepare uniform and phase-pure 2H-WSe 2 semiconducting nanosheets at a large scale, which involves the supercritical carbon dioxide (SC-CO 2) treatment and a mild sonication-assisted exfoliation process in aqueous solution. The as-prepared 2H-WSe 2 nanosheets preserve the intrinsic physical properties and intact crystal structures, as confirmed by Raman, x-ray photoelectron spectroscopy (XPS), and scanning transmission electron microscope (STEM). The uniform 2H-WSe 2 nanosheets can disperse well in water for over six months. Such good dispersivity and uniformity enable these nanosheets to self-assembly into thickness-controlled thin films for scalable fabrication of large-area arrays of thin-film electronics. The electronic transport and photoelectronic properties of the field-effect transistor based on the self-assembly 2H-WSe 2 thin film have also been explored.(paper)