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Stable organic thin-film transistors.

Xiaojia Jia1, Canek Fuentes-Hernandez1, Cheng-Yin Wang1

  • 1Center for Organic Photonics and Electronics, School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.

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|January 18, 2018
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Summary

We developed highly stable organic thin-film transistors (OTFTs) using a novel bilayer gate dielectric. These advanced OTFTs show improved operational stability, paving the way for commercial applications.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Semiconductor Devices

Background:

  • Organic thin-film transistors (OTFTs) offer cost-effective fabrication on flexible substrates.
  • Current OTFTs face challenges with operational stability, hindering commercial use.
  • Charge mobility in OTFTs is competitive, but stability remains a concern.

Purpose of the Study:

  • To characterize the operational stability of OTFTs with a novel ultrathin bilayer gate dielectric.
  • To investigate the aging mechanisms affecting threshold voltage shifts in OTFTs.
  • To assess the performance of these OTFTs compared to existing thin-film transistor (TFT) technologies.

Main Methods:

  • Fabrication of OTFTs using an ultrathin bilayer gate dielectric (CYTOP and Al2O3:HfO2 nanolaminate).
  • Exhaustive characterization of threshold voltage shifts under various conditions (time, temperature).
  • Modeling of threshold voltage shifts using a double stretched-exponential (DSE) function.

Main Results:

  • Microcrystalline OTFTs (μc-OTFTs) exhibited minimal threshold voltage shifts (<0.2 V) over extended periods (up to 5.9 × 10^5 s).
  • Field-effect carrier mobility values reached up to 1.6 cm² V⁻¹ s⁻¹.
  • The DSE modeling indicated two compensating aging mechanisms contributing to high stability.
  • Operational stability showed a significant improvement (at least one order of magnitude) at temperatures up to 75°C.

Conclusions:

  • The novel bilayer gate dielectric significantly enhances the operational stability of OTFTs.
  • The identified aging mechanisms provide insights into achieving long-term device reliability.
  • These stable OTFTs achieve performance levels comparable to commercial TFTs, enabling broader applications.