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Field Effect Transistor01:29

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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Printing Semiconductor-Insulator Polymer Bilayers for High-Performance Coplanar Field-Effect Transistors.

Laju Bu1, Mengxing Hu1, Wanlong Lu1,2

  • 1School of Science and Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, China.

Advanced Materials (Deerfield Beach, Fla.)
|November 28, 2017
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Summary

Researchers developed a simplified printing method for organic coplanar transistors. This technique creates a semiconductor-insulator bilayer, enhancing performance and simplifying circuit fabrication for next-generation electronics.

Keywords:
coplanar transistorsorganic electronicspolymer blendsprintingvertical phase separation

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Area of Science:

  • Organic electronics
  • Materials science
  • Nanotechnology

Background:

  • Coplanar transistors offer reduced material use, minimized leakage, and simplified fabrication for advanced electronics.
  • Existing methods for fabricating coplanar transistors can be complex and resource-intensive.

Purpose of the Study:

  • To develop a simplified, one-step printing method for fabricating organic coplanar transistors.
  • To investigate the formation of a semiconductor-insulator bilayer structure and its impact on transistor performance.
  • To explore the use of the insulator layer as a tunable floating gate.

Main Methods:

  • A one-step, drop-casting-like printing method using a poly(3-hexylthiophene) (P3HT)/polystyrene (PS) blend.
  • Manipulation of solution dewetting dynamics on metal electrodes and SiO2 dielectric for selective polymer confinement.
  • Utilizing vertical phase separation during solvent evaporation to form a P3HT/PS semiconductor-insulator bilayer.

Main Results:

  • Selective polymer confinement on electrodes and formation of a semiconductor-insulator bilayer structure.
  • Achieved effective field-effect mobility > 1 cm^2 V^-1 s^-1 and an on/off ratio > 10^7.
  • Demonstrated tunable threshold voltage and effective mobility via gate-stress induced electret formation.

Conclusions:

  • The developed printing method simplifies the fabrication of organic coplanar transistors.
  • The resulting semiconductor-insulator bilayer structure significantly improves transistor performance.
  • These transistors offer performance comparable to amorphous silicon transistors and enable new tuning mechanisms.