Ladder-type silsesquioxane copolymer gate dielectrics for gating solution-processed IGZO field-effect transistors

Min Je Kim, Young Min Heo, Jeong Ho Cho

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Field-effect transistors (FETs) based on solution-processed indium-gallium-zinc oxide (IGZO) exhibited excellent electrical properties, including a high carrier mobility over 1 cm2/V s and an on/off current ratio over 107. Solution-processable gate dielectric materials with excellent electrical strength were required instead of inorganic oxide gate dielectrics such as SiO2, Al2O3, and HfO2. In this manuscript, we demonstrated the use of a ladder-type poly(phenyl-co-methacryl silsesquioxane) (PPMSQ) copolymer as a gate dielectric in IGZO FETs. Methacryloxypropyl groups in the copolymer were introduced to crosslink the polymer chains via thermal annealing. Thermal annealing at 200 °C enhanced the electrical strength of the gate dielectric layer because of the formation of a network structure with a reduced free volume. The resulting IGZO FETs based on 200 °C-annealed ladder-type PPMSQ gate dielectrics exhibited an electron mobility of 1.2 (±0.05) cm2/V s, a threshold voltage of 17 (±2) V, and an on/off current ratio of 1.5 (±0.7) × 108. The use of the polymeric ladder-type PPMSQ gate dielectrics for gating the IGZO FETs provided a novel approach to realizing future flexible electronics.

Original languageEnglish
Pages (from-to)41-46
Number of pages6
JournalOrganic Electronics
Publication statusPublished - 2017 Apr 1

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry


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