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Surface-Modified Substrates for Quantum Dot Inks in Printed Electronics.

Lingju Meng1, Tao Zeng1,2, Yihan Jin1,3

  • 1Department of Electrical and Computer Engineering, University of Alberta, 9107-116 Street, Edmonton, Canada T6G 2V4.

ACS Omega
|August 29, 2019
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Summary
This summary is machine-generated.

Researchers developed a chlorine-based surface modification for substrates, enabling better performance of printable electronics using colloidal quantum dot (QD) inks. This strategy improves compatibility between polar solvents and hydrophobic surfaces, crucial for flexible electronic devices.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Printed electronics offer low-cost, flexible device solutions.
  • Colloidal quantum dots (QDs) are promising electronic inks due to their solution processability.
  • Processing incompatibility between polar QD inks and hydrophobic substrates hinders device fabrication.

Purpose of the Study:

  • To develop a surface modification strategy for substrates compatible with polar-solvent-based QD inks.
  • To achieve both trap-site suppression and a hydrophilic surface on substrates.
  • To demonstrate the efficacy of the modified substrate in printed electronic devices.

Main Methods:

  • Surface modification of substrates using chlorine.
  • Characterization of surface properties, including contact angle measurements.
  • Fabrication and testing of a field-effect transistor using PbS QD ink on the modified substrate.

Main Results:

  • Chlorine treatment effectively passivates surface defects and creates a hydrophilic surface (contact angle as low as 20°).
  • The strategy is applicable to various substrate types (SiO2, polymers, inorganic materials).
  • A PbS QD ink-based field-effect transistor on a Cl-passivated substrate achieved a mobility of 4.36 × 10⁻³ cm²/V s, indicating effective trap suppression.

Conclusions:

  • Chlorine surface modification is a viable strategy for enabling the use of polar-solvent-based QD inks in printed electronics.
  • The modified substrates enhance device performance by suppressing trap sites.
  • This approach opens possibilities for fabricating advanced QD ink-based devices on diverse substrates.