Proton-Conductor-Gated MoS2 Transistors with Room Temperature Electron Mobility of >100 cm2 V-1 s-1

Yongsuk Choi, Hyunwoo Kim, Jeehye Yang, Seung Won Shin, Soong Ho Um, Sungjoo Lee, Moon Sung Kang, Jeong Ho Cho

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Room temperature electron mobility of >100 cm2 V-1 s-1 is achieved for a few-layer MoS2 transistor by use of a polyanionic proton conductor as the top-gate dielectric of the device. The use of a proton conductor that inherently exhibits a cationic transport number close to 1 yields unipolar electron transport in the MoS2 channel. The high mobility value is attributed to the effective formation of an electric double layer by the proton conductor, which facilitates electron injection into the MoS2 channel, and to the effective screening of the charged impurities in the vicinity of the device channel. Through careful temperature-dependent transistor and capacitor measurements, we also confirm quenching of the phonon modes in the proton-conductor-gated MoS2 channel, which should also contribute to the achieved high mobility. These devices are then used to assemble a simple resistive-load inverter logic circuit, which can be switched at high frequencies above 1 kHz.

Original languageEnglish
Pages (from-to)4527-4535
Number of pages9
JournalChemistry of Materials
Issue number14
Publication statusPublished - 2018 Jul 24

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry


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