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Low-Concentration Indium Doping in Solution-Processed Zinc Oxide Films for Thin-Film Transistors.

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Low-concentration indium doping improves solution-processed zinc oxide films and thin-film transistors. Optimal 5% indium content enhances crystalline quality, reduces grain size, and boosts TFT performance.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • Solution-processed zinc oxide (ZnO) films are promising for electronic applications.
  • Indium (In) doping is explored to enhance ZnO properties.
  • Thin-film transistors (TFTs) require optimized semiconductor layers for performance.

Purpose of the Study:

  • To investigate the effect of low-concentration indium doping on solution-processed ZnO films.
  • To analyze the chemical, structural, and electrical properties of In-doped ZnO.
  • To determine the optimal In concentration for ZnO TFT performance.

Main Methods:

  • Thermogravimetry and differential scanning calorimetry for thermal analysis.
  • X-ray diffraction and field-emission scanning microscopy for structural characterization.
  • Fabrication and electrical testing of bottom-gate/top-contact In-doped ZnO TFTs.

Main Results:

  • Annealing at 400 °C for 40 min yielded optimal In-doped ZnO films.
  • Increasing In content enhanced metal-oxygen bonding and reduced metal-hydroxyl bonding.
  • Improved crystalline quality and reduced grain size were observed with In doping.
  • Optimal In concentration of 5% significantly enhanced TFT field-effect mobility and on/off current ratio.

Conclusions:

  • Low-concentration indium doping is critical for tailoring the properties of solution-processed ZnO.
  • Indium incorporation effectively modulates film morphology and enhances TFT performance.
  • 5% indium doping represents an optimal concentration for solution-processed ZnO TFTs.