Low-voltage, high-performance polymeric field-effect transistors based on self-assembled monolayer-passivated HfOx dielectrics: Correlation between trap density, carrier mobility, and operation voltage

Dae Kyu Kim, Myeongjae Lee, Bong Soo Kim, Jong-Ho Choi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We report on high-performance polymeric field-effect transistors (PFETs) operating at low voltages (Vop) using a self-assembled monolayer (SAM)-passivated HfOx dielectric layer. A diketopyrrolopyrrole and quaterthiophene-based copolymer (PDPP2DT-T2) was spin-coated in air as an active channel material on top of a HfOx gate dielectric that was passivated with n-octyltrichlorosilane (OTS), n-octadecyltrichlorosilane (ODTS), and n-dodecylphosphonic acid (PAC12) SAMs. The high capacitance and low leakage current of the SAM-passivated HfOx dielectrics enabled the devices to operate at |Vop| of less than 4 V. In particular, the PFETs using ODTS-passivated HfOx demonstrated a high hole mobility (μeff h) of 1.98 cm2 V−1 s−1, a current on/off ratio of 1.4 × 104, and a threshold voltage of −0.8 V despite the fact that the device fabrication and all measurements were conducted under ambient conditions without encapsulation. Moreover, the μeff h value observed in this study is the best for high-k-dielectric-based low-voltage PFETs reported to date. This work demonstrates that our facile modification of high-k dielectrics with SAMs is a highly effective method for realizing high-performance semiconducting copolymer-based transistors working at a low Vop regime with low power consumption.

Original languageEnglish
Pages (from-to)135-143
Number of pages9
JournalOrganic Electronics: physics, materials, applications
Volume74
DOIs
Publication statusPublished - 2019 Nov 1

Keywords

  • Carrier mobility
  • Conjugated polymers
  • Crystallinity
  • Organic electronics
  • Polymer field effect transistors

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Low-voltage, high-performance polymeric field-effect transistors based on self-assembled monolayer-passivated HfO<sub>x</sub> dielectrics: Correlation between trap density, carrier mobility, and operation voltage'. Together they form a unique fingerprint.

  • Cite this