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  11. Rapid Activation Of A Solution-processed Aluminum Oxide Gate Dielectric Through Intense Pulsed Light Irradiation

Rapid activation of a solution-processed aluminum oxide gate dielectric through intense pulsed light irradiation

Yeon-Wha Oh1,2, Hoon Kim3, Lee-Mi Do3

  • 1Division of Nano Convergence Technology Development, Nantional NanoFAB Center Daejeon 34141 South Korea.

RSC Advances
|November 25, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Rapid activation of aluminum oxide dielectric films using intense pulsed light significantly reduces processing time. This method enables efficient fabrication of high-performance thin-film transistors under ambient conditions.

Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Solution-processed gate dielectric films are crucial for low-cost electronic device fabrication.
  • Traditional processing methods for aluminum oxide films are time-consuming and require controlled atmospheres.
  • Developing rapid and ambient-compatible processing techniques is essential for advancing thin-film electronics.

Purpose of the Study:

  • To investigate the rapid activation of solution-processed aluminum oxide (AlOₓ) gate dielectric films using intense pulsed light (IPL) irradiation.
  • To reduce the processing time and enable fabrication under ambient atmosphere.
  • To evaluate the electrical and physical properties of the IPL-treated AlOₓ films and their performance in thin-film transistors (TFTs).

Main Methods:

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  • Aluminum precursor films were deposited via solution processing.
  • Intense pulsed light (IPL) irradiation was applied to convert precursor films into aluminum oxide dielectric films within seconds.
  • Surface morphology, leakage current density, and dielectric constant of the AlOₓ films were characterized.
  • Indium gallium zinc oxide (IGZO) thin-film transistors (TFTs) were fabricated using the IPL-treated AlOₓ as the gate dielectric.

    • Main Results:

    • Complete conversion of aluminum precursor to AlOₓ dielectric film was achieved in 30 seconds (450 pulses) under ambient atmosphere.
    • The IPL-treated AlOₓ films exhibited a smooth surface and a low leakage current density (<10⁻⁸ A cm⁻² at 2 MV cm⁻¹).
    • The dielectric constant of the AlOₓ layer was measured to be approximately 7.
    • Fabricated IGZO TFTs demonstrated a field-effect mobility of 2.99 cm² V⁻¹ s⁻¹, a threshold voltage of 0.73 V, a subthreshold swing of 180 mV/decade, and an on/off current ratio of 3.9 × 10⁶.

    Conclusions:

    • IPL irradiation offers a rapid and efficient method for activating solution-processed aluminum oxide gate dielectric films.
    • This technique significantly reduces processing time and allows for fabrication under ambient conditions, making it suitable for large-scale manufacturing.
    • The high-quality dielectric properties and successful integration into IGZO TFTs highlight the potential of IPL processing for next-generation electronic devices.