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Sci Adv. 2019 Jul 26;5(7):eaaw3180. doi: 10.1126/sciadv.aaw3180. eCollection 2019 Jul.

Atomically thin three-dimensional membranes of van der Waals semiconductors by wafer-scale growth.

Author information

1
Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Republic of Korea.
2
Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
3
Department of Chemistry and Chemical Biology and Department of Physics, Harvard University, Cambridge, MA 02138, USA.
4
Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea.

Abstract

We report wafer-scale growth of atomically thin, three-dimensional (3D) van der Waals (vdW) semiconductor membranes. By controlling the growth kinetics in the near-equilibrium limit during metal-organic chemical vapor depositions of MoS2 and WS2 monolayer (ML) crystals, we have achieved conformal ML coverage on diverse 3D texture substrates, such as periodic arrays of nanoscale needles and trenches on quartz and SiO2/Si substrates. The ML semiconductor properties, such as channel resistivity and photoluminescence, are verified to be seamlessly uniform over the 3D textures and are scalable to wafer scale. In addition, we demonstrated that these 3D films can be easily delaminated from the growth substrates to form suspended 3D semiconductor membranes. Our work suggests that vdW ML semiconductor films can be useful platforms for patchable membrane electronics with atomic precision, yet large areas, on arbitrary substrates.

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