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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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Solution-Processed Organic Field-Effect Transistors with High Performance and Stability on Paper Substrates.

Vivek Raghuwanshi1, Deepak Bharti1, Ajay Kumar Mahato1

  • 1Department of Electrical Engineering , Indian Institute of Technology Jodhpur , Jodhpur , Rajasthan 342037 , India.

ACS Applied Materials & Interfaces
|February 1, 2019
PubMed
Summary

High-performance organic field-effect transistors were fabricated on paper. These stable, flexible devices show excellent electrical properties and potential for novel applications like phototransistors.

Keywords:
TIPS-pentacene:polymer blendlow voltageoperational stabilityorganic field-effect transistors (OFETs)paper substrate

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Device Physics

Background:

  • Organic field-effect transistors (OFETs) are crucial for flexible electronics.
  • Developing stable and high-performance OFETs on low-cost substrates like paper remains a challenge.

Purpose of the Study:

  • To fabricate high-performance and operationally stable organic field-effect transistors on a paper substrate.
  • To investigate the electrical characteristics and stability of these novel devices.

Main Methods:

  • Fabrication of OFETs using a TIPS-pentacene:polystyrene blend active layer and a poly(4-vinylphenol)/HfO2 hybrid gate dielectric on a PowerCoat HD 230 paper substrate.
  • Characterization of device performance, including field-effect mobility, threshold voltage, and current on-off ratio.
  • Assessment of device stability under gate bias stress, humidity, and ambient storage conditions.

Main Results:

  • Achieved excellent p-channel characteristics with high field-effect mobility (up to 0.44 cm2 V-1 s-1) and a current on-off ratio of ~10^5.
  • Demonstrated remarkable operational stability under gate bias stress and repeated scans, with negligible performance spread.
  • Exhibited stable electrical characteristics after prolonged humidity exposure and an excellent shelf life (>6 months) in ambient conditions.
  • Observed performance deterioration under high-temperature thermal stress due to crack formation in the active layer.

Conclusions:

  • Successfully fabricated high-performance, stable organic field-effect transistors on paper substrates.
  • The developed devices show great promise for flexible electronics, including potential for paper-based phototransistors.
  • While stable in humidity and ambient conditions, high-temperature stability needs further improvement.