A Study on Organic Thin-Film Transistors Using Hf-La Oxides with Different la Contents as Gate Dielectrics

Chuan Yu Han, Yuan Xiao Ma, Wing Man Tang, Xiao Li Wang, P. T. Lai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)


The effects of La content in HfLaO gate dielectric on the performance of pentacene organic thin-film transistor (OTFT) fabricated on Si have been studied. The OTFT with Hf0.103La0.897Oygate dielectric shows high performance such as high carrier mobility of 3.45 cm2V1. s1(132 times and 40 times higher than those of devices using Hf oxide and La oxide, respectively), small threshold voltage of-2.09 V, and negligible hysteresis of-0.029 V. Binding-energy shift of Hf 4f peak in the X-ray photoelectron spectroscopy spectrum indicates that La incorporation can passivate the oxygen vacancies in HfO2. Atomic force microscope reveals that the La incorporation can reduce the surface roughness of the gate dielectric by suppressing the crystallization of HfO2. Therefore, by using Hf0.103La0.897Oyas gate dielectric, OTFT with high carrier mobility and small threshold voltage can be obtained.
Original languageEnglish
Pages (from-to)1107-1112
Number of pages6
JournalIEEE Transactions on Electron Devices
Issue number3
Publication statusPublished - 1 Mar 2018


  • Hf-La oxide
  • highκ dielectric
  • hysteresis
  • organic thin-film transistor (OTFT)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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