Tailoring the Electrical Characteristics of MoS2FETs through Controllable Surface Charge Transfer Doping Using Selective Inkjet Printing

Inho Jeong, Kyungjune Cho, Seobin Yun, Jiwon Shin, Jaeyoung Kim, Gyu Tae Kim, Takhee Lee, Seungjun Chung

Research output: Contribution to journalArticlepeer-review

Abstract

Surface charge transfer doping (SCTD) has been regarded as an effective approach to tailor the electrical characteristics of atomically thin transition metal dichalcogenides (TMDs) in a nondestructive manner due to their two-dimensional nature. However, the difficulty of achieving rationally controlled SCTD on TMDs via conventional doping methods, such as solution immersion and dopant vaporization, has impeded the realization of practical optoelectronic and electronic devices. Here, we demonstrate controllable SCTD of molybdenum disulfide (MoS2) field-effect transistors using inkjet-printed benzyl viologen (BV) as an n-type dopant. By adjusting the BV concentration and the areal coverage of inkjet-printed BV dopants, controllable SCTD results in BV-doped MoS2 FETs with elaborately tailored electrical performance. Specifically, the suggested solvent system creates well-defined droplets of BV ink having a volume of ∼2 pL, which allows the high spatial selectivity of SCTD onto the MoS2 channels by depositing the BV dopant on demand. Our inkjet-printed SCTD method provides a feasible solution for achieving controllable doping to modulate the electrical and optical performances of TMD-based devices.

Original languageEnglish
Pages (from-to)6215-6223
Number of pages9
JournalACS nano
Volume16
Issue number4
DOIs
Publication statusPublished - 2022 Apr 26

Keywords

  • chemical doping
  • field-effect transistor
  • inkjet printing
  • molybdenum disulfide
  • surface charge transfer doping

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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