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Inkjet-printed all solid-state electrochromic devices based on NiO/WO3 nanoparticle complementary electrodes.

Guofa Cai1, Peter Darmawan1, Mengqi Cui1

  • 1School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore. pslee@ntu.edu.sg.

Nanoscale
|November 28, 2015
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Summary

Inkjet printing enables the creation of advanced nanostructured films for energy-saving applications. This study developed a versatile ink for producing high-performance nickel oxide (NiO) and tungsten oxide (WO3) electrochromic films.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Storage

Background:

  • Nanostructured thin films are crucial for energy conversion and storage.
  • Multi-layered films are key components in energy-saving building applications.
  • Inkjet printing offers a cost-effective method for depositing nanostructured materials.

Purpose of the Study:

  • To develop a versatile ink formulation for inkjet printing nanostructured NiO and WO3 films.
  • To create high-performance electrochromic electrodes for energy-saving applications.
  • To assemble and evaluate an all-solid-state electrochromic device.

Main Methods:

  • Development of a specialized ink formulation for NiO and WO3 nanoparticles.
  • Utilizing inkjet printing for the deposition of multi-layered nanostructured films on ITO-coated glass.
  • Characterization of electrochromic properties, including optical modulation and coloration efficiency.

Main Results:

  • Achieved porous, continuous NiO and WO3 films with strong adhesion via inkjet printing.
  • The NiO film (9 layers) demonstrated 64.2% optical modulation and 136.7 cm²/C coloration efficiency.
  • An assembled all-solid-state device showed 75.4% optical modulation and 131.9 cm²/C coloration efficiency.

Conclusions:

  • A versatile ink formulation enables successful inkjet printing of NiO and WO3 electrochromic films.
  • Inkjet-printed NiO films function as both ion storage and complementary electrochromic layers, enhancing device performance.
  • The developed all-solid-state device offers significant optical modulation for energy-saving applications.