4.6 Article

Facile Room Temperature Routes to Improve Performance of IGZO Thin-Film Transistors by an Ultrathin Al2O3 Passivation Layer

Journal

IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 65, Issue 2, Pages 537-541

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2017.2786473

Keywords

Field-effect passivation; In-Ga-Zn-O thin-film transistors (IGZO TFTs); room temperature

Funding

  1. National Key Research and Development Program of China [2016YFB0401504]
  2. NSFC [51771074, U1601651]
  3. National Key Basic Research and Development Program of China (973 program) [2015CB655004]
  4. Guangdong Natural Science Foundation [2016A030313459, 2017A030310028]
  5. Science and Technology Project of Guangdong Province [2014B090915004, 2016B090907001]
  6. Project for Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme

Ask authors/readers for more resources

Although oxide thin-film transistors (TFTs) have drawn great interests in flexible displays, a key obstacle is the requirement of high-temperature annealing to realized mobility >10 cm(2)/V . s. In this paper, a fully room-temperature strategy, involving the deposition of similar to 10 nm In-Ga-Zn-O (IGZO) channel layer and similar to 4 nm Al2O3 passivation layer, is introduced. The as-prepared flexible TFT on polymide substrate exhibits a saturation mobility of 15.3 cm(2)/V. s, V-th of 3.08 V, and on/off current ratio of 2.3 x 10(7). Thickness-dependent analysis indicates that the interface between Al2O3 and IGZO is composed of negative O-rich layer, which impel the energy band bending inside the IGZO layers and release of electrons from traps. This paper opens up a route to achieve fully room-temperature fabrication of high-performance flexible TFT.

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