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Uniform Silver Nanowire Patterned Electrode on Robust PEN Substrate Using Poly(2-hydroxyethyl methacrylate)

Na Yeon Kwon1, Su Hong Park1, Yoonjoo Lee1

  • 1Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea.

ACS Applied Materials & Interfaces
|July 15, 2022
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Summary

This study presents a new method for creating flexible silver nanowire electrodes on PEN substrates, improving adhesion and patterning for advanced applications. The resulting electrodes exhibit excellent optical and electrical properties, suitable for high-performance polymer solar cells.

Keywords:
flexible organic photovoltaicsmechanical stabilitypatterned electrodesilver nanowiretransparent conductive electrode

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Flexible Electronics

Background:

  • Flexible transparent electrodes (FTEs) are crucial for next-generation electronics, with silver nanowires (AgNWs) offering an alternative to brittle indium tin oxide (ITO).
  • AgNW electrodes face challenges including poor substrate adhesion, surface roughness, and patterning difficulties, limiting their widespread adoption in flexible devices.

Purpose of the Study:

  • To develop a novel strategy for fabricating patterned AgNW-based flexible electrodes on poly(ethylene 2,6-naphthalate) (PEN) substrates.
  • To enhance the optical and electrical properties, adhesion, and processability of AgNW electrodes for demanding applications.

Main Methods:

  • Introduced poly(2-hydroxyethyl methacrylate) on PEN to improve AgNW adhesion and dispersibility.
  • Utilized a coating of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) with a photosensitizer for surface smoothing and patterning.
  • Optimized AgNW concentration to control density and thickness for superior sheet resistance and transmittance.

Main Results:

  • Achieved optimized AgNW electrodes with a sheet resistance of 22.6 Ω/□ and 92.3% transmittance at 550 nm.
  • Demonstrated effective patterning and improved surface morphology of the AgNW electrodes.
  • Fabricated polymer solar cells (PSCs) using the AgNW electrodes, achieving a high power conversion efficiency of 11.20%.

Conclusions:

  • The developed AgNW-based flexible electrodes offer a viable alternative to ITO, exhibiting comparable performance in PSCs.
  • The strategy successfully addresses key limitations of AgNW electrodes, enabling excellent optical, electrical, and mechanical properties.
  • These findings pave the way for robust and efficient flexible electronic devices.