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Solution-Processed "Silver-Bismuth-Iodine" Ternary Thin Films for Lead-Free Photovoltaic Absorbers
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Transparent TiO2/Cu/TiO2 Multilayer for Electrothermal Application.

Jingjing Peng1, Changshan Hao1, Hongyan Liu1

  • 1Beijing Engineering Research Center of Advanced Structural Transparencies for the Modern Traffic System, Beijing Institute of Aeronautical Materials, Beijing 100095, China.

Materials (Basel, Switzerland)
|March 6, 2021
PubMed
Summary
This summary is machine-generated.

Transparent titanium dioxide/copper/titanium dioxide (TiO2/Cu/TiO2) multilayers were developed without indium. Optimized 10 nm copper layers achieved excellent electrical and optical properties, enabling reliable electrothermal applications.

Keywords:
annealingelectrical propertyelectrothermal heatingoptical propertytransparent conductive oxides

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thin Film Physics

Background:

  • Transparent conductive films are crucial for various electronic and optoelectronic devices.
  • Indium-tin oxide (ITO) is the dominant transparent conductive material but faces cost and scarcity issues.
  • Development of indium-free alternatives is essential for sustainable technology.

Purpose of the Study:

  • To fabricate and characterize highly transparent indium-free TiO2/Cu/TiO2 multilayers.
  • To investigate the influence of copper (Cu) mid-layer thickness and annealing temperature on film properties.
  • To evaluate the electrothermal performance and stability of the developed multilayers.

Main Methods:

  • Fabrication of TiO2/Cu/TiO2 multilayers using sputtering techniques.
  • Optimization of Cu mid-layer thickness (critical thickness of 10 nm identified).
  • Annealing treatments at various temperatures to induce partial crystallization of TiO2.
  • Characterization of electrical conductivity, optical transmittance, and electrothermal response.

Main Results:

  • Achieved highly transparent and conductive TiO2/Cu/TiO2 multilayers without indium.
  • Identified a critical Cu thickness of 10 nm for optimal electrical and optical performance.
  • Figure of merit reached 5 × 10^-3 Ω^-1, indicating excellent performance.
  • Partial crystallization of TiO2 upon annealing significantly enhanced film properties.
  • Multilayers demonstrated stable electrothermal performance, reaching over 100 °C at a heating rate of 2 °C/s without damage.

Conclusions:

  • Successfully developed reliable, transparent, and indium-free TiO2/Cu/TiO2 multilayers.
  • The optimized multilayers exhibit promising properties for electrothermal applications.
  • Annealing-induced crystallization plays a key role in enhancing performance.
  • These findings offer a viable alternative to indium-based transparent conductive materials.