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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Hydrogen diffusion and its electrical properties variation as a function of the IGZO stacking structure.

Hee Yeon Noh1, Woo-Geun Lee2, Haripriya G R1

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This study clarifies how hydrogen and oxygen vacancies influence electrical properties in amorphous indium gallium zinc oxide (a-IGZO) semiconductors. Hydrogen diffusion from passivation layers significantly alters resistivity, with different effects depending on the passivation material used.

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Solid State Chemistry

Background:

  • Oxygen vacancies and hydrogen are key charge carrier sources in oxide semiconductors.
  • The precise carrier generation mechanism involving hydrogen and oxygen vacancies in amorphous indium gallium zinc oxide (a-IGZO) remains unclear.

Purpose of the Study:

  • To investigate the influence of hydrogen on the electrical properties of a-IGZO thin films.
  • To elucidate the variation mechanisms of electrical properties due to hydrogen diffusion from passivation layers.

Main Methods:

  • Placing silicon oxide (SiOₓ) and silicon nitride (SiNₓ) passivation layers on a-IGZO to control hydrogen diffusion.
  • Analyzing hydrogen penetration depth and its impact on the a-IGZO active layer.
  • Observing changes in electrical resistivity and interfacial reactions.

Main Results:

  • Hydrogen diffusion depth was sufficient to impact the entire a-IGZO layer.
  • SiNₓ passivation led to a direct increase in a-IGZO electrical resistivity due to hydrogen.
  • SiOₓ passivation induced different effects, including oxygen reactions and altered O-H bonding at the interface.

Conclusions:

  • The bonding method of hydrogen and oxygen significantly influences the contribution of free electrons and thus electrical resistivity in a-IGZO.
  • Passivation layer choice (SiOₓ vs. SiNₓ) critically determines the hydrogen-induced electrical property variations in a-IGZO semiconductors.