Demonstration of 40-nm Channel Length Top-Gate p-MOSFET of WS2 Channel Directly Grown on SiOx/Si Substrates Using Area-Selective CVD Technology

Yun Yan Chung, Jia Min Shieh, Sheng Kai Su, Hung Li Chiang, Tzu Chiang Chen, Lain Jong Li, H. S.Philip Wong, Wen Bin Jian, Chao Hsin Chien*, Kuan Cheng Lu, Chao Ching Cheng, Ming Yang Li, Chao Ting Lin, Chi Feng Li, Jyun Hong Chen, Tung Yen Lai, Kai Shin Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


For high-volume manufacturing of 2-D transistors, area-selective chemical reaction deposition (CVD) growth is able to provide good-quality 2-D layers and may be more effective than exfoliation from bulk crystals or wet/dry transfer of large-area as-grown 2-D layers. We have successfully grown continuous and uniform WS2 film comprising around seven layers by area-selective CVD approach using patterned tungsten source/drain metals as the seeds. The growth mechanism is inferred and supported by the transmission electron microscope (TEM) images, as well. The first top-gate MOSFETs of CVD-WS2 channels on SiOx/Si substrates are demonstrated to have good short channel electrical characteristics: ON-/OFF-ratio of 106, a subthreshold swing of 97 mV/decade, and nearly zero drain-induced barrier lowering (DIBL).

Original languageEnglish
Article number8889483
Pages (from-to)5381-5386
Number of pages6
JournalIEEE Transactions on Electron Devices
Issue number12
StatePublished - Dec 2019


  • Area selective chemical reaction deposition (CVD)
  • p-MOSFET
  • short channel device
  • tungsten disulfide
  • WS2

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