Fig. 13. The fabrication process of the WSe2 continuous film. (a) Schematic showing the WSe2 domains attach to the step edges of sapphire. (b) AFM image of the WSe2 domains nucleating at the step edges of sapphire. (c) SEM image of the WSe2 domains with a coinciding orientation. (a–c) Reproduced with permission.83 Copyright 2015, American Chemical Society. (d) Schematic illustration showing various W(CO)6 flow rates at nucleation, ripening, lateral growth, and full coalesced stage of growing WSe2. Reproduced with permission.98 Copyright 2018, American Chemical Society. (e) OM image of the WSe2 flakes grown on the downstream region with two predominant directions. (f) WSe2 flakes exhibiting the random distribution on the upstream region. (e and f) Reproduced with permission.99 Copyright 2020, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature.
