Scalable preparation of water-soluble ink of few-layered WSe<sub>2</sub> nanosheets for large-area electronics

Scalable preparation of water-soluble ink of few-layered WSe₂ nanosheets for large-area electronics

Xian Guoyu^{1, 2}, Zhang Jianshuo^{2, 3}, Liu Li¹, Zhou Jun², Liu Hongtao², Bao Lihong², Shen Chengmin², Li Yongfeng³, Qin Zhihui^{1, §}, Yang Haitao^{2, ‡}

(a) Optical image of a smooth thin film of WSe₂ nanosheets. (b) Optical image of layer-by-layer self-assembly thin film of WSe₂ nanosheets. Numbers 1–3 indicate the layers of WSe₂ films, the regions with different colors show the films with different thicknesses. (c) XRD pattern of the resulting thin film displaying only {001} planes. (d) Schematic configuration and optical images of the back-gate WSe₂ thin-film transistors on the 300-nm-thick SiO₂/Si substrate.