Monolayer MoS2 field-effect transistors patterned by photolithography for active matrix pixels in organic light-emitting diodes

Hyeokjae Kwon, Sourav Garg, Ji Hoon Park, Yeonsu Jeong, Sanghyuck Yu, Seongsin M. Kim, Patrick Kung, Seongil Im

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Two-dimensional molybdenum disulfide (MoS2) has substantial potential as a semiconducting material for devices. However, it is commonly prepared by mechanical exfoliation, which limits flake size to only a few micrometers, which is not sufficient for processes such as photolithography and circuit patterning. Chemical vapor deposition (CVD) has thus become a mainstream fabrication technique to achieve large-area MoS2. However, reports of conventional photolithographic patterning of large-area 2D MoS2-based devices with high mobilities and low switching voltages are rare. Here we fabricate CVD-grown large-area MoS2 field-effect transistors (FETs) by photolithography and demonstrate their potential as switching and driving FETs for pixels in analog organic light-emitting diode (OLED) displays. We spin-coat an ultrathin hydrophobic polystyrene layer on an Al2O3 dielectric, so that the uniformity of threshold voltage (Vth) of the FETs might be improved. Our MoS2 FETs show a high linear mobility of approximately 10 cm2 V−1 s−1, due to a large grain size around 60 μm, and a high ON/OFF current ratio of 108. Dynamic switching of blue and green OLED pixels is shown at ~5 V, demonstrating their application potential.

Original languageEnglish
Article number9
Journalnpj 2D Materials and Applications
Volume3
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics
  • Chemistry(all)

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