Improved performance of bottom-contact organic thin-film transistor using Al doped HfO2 gate dielectric

Wing Man Tang, Uraib Aboudi, J. Provine, Roger T. Howe, Hon Sum Philip Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)


Aluminum doped HfO2 (HfAlO) prepared by atomic layer deposition is investigated as gate dielectric for low-voltage organic thin-film transistors (OTFTs). The HfAlO film exhibits a low leakage current density of 4.92×10?8 A/cm2 at-3 MV/cm, which is 70% smaller than its HfO2 counterpart. In addition, copper phthalocyanine (CuPc) OTFT with HfAlO dielectric has an average mobility μ (2.58±0.32×10?3 cm2/Vs) increased by 58%, sub-threshold slope SS (0.9 ±0.11 V/decade) decreased by 11%, and ON/OFF ratio ION/IOFF (3.1 ±1.3 ±103) increased by 86% as compared with those with HfO2 as gate dielectric (μ = 1.63 ±0.27 ±10?3 cm2/Vs; SS = 1.01 ±0.1 V/decade; ION/IOFF = 1.7 ±0.77 ±103). All these could be ascribed to the inclusion of Al in the HfO2 film, which increases the conduction band offset and the bandgap and improves the dielectric and interface quality. The temperature effect on the performance of OTFTs is also investigated..
Original languageEnglish
Article number6824766
Pages (from-to)2398-2403
Number of pages6
JournalIEEE Transactions on Electron Devices
Issue number7
Publication statusPublished - 1 Jan 2014


  • Bottom-contact
  • copper phthalocyanine (CuPc)
  • gate dielectric
  • high-k
  • organic thin-film transistor (OTFT)

ASJC Scopus subject areas

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


Dive into the research topics of 'Improved performance of bottom-contact organic thin-film transistor using Al doped HfO2 gate dielectric'. Together they form a unique fingerprint.

Cite this