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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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High mobility field effect transistors based on macroscopically oriented regioregular copolymers.

Hsin-Rong Tseng1, Lei Ying, Ben B Y Hsu

  • 1Center for Polymers and Organic Solids, University of California -Santa Barbara, Santa Barbara, California 93106, United States.

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High molecular weight conjugated polymers demonstrate improved charge carrier mobility in field-effect transistors through controlled chain orientation. This advancement is key for developing flexible and low-cost electronic devices.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Polymer Chemistry

Background:

  • Semiconducting conjugated polymers are essential for flexible and low-cost electronic applications.
  • Field-effect transistors (FETs) are a key component in these electronic devices.
  • Achieving high charge carrier mobility in polymer-based FETs is crucial for performance.

Purpose of the Study:

  • To significantly improve the charge carrier mobility of high molecular weight conjugated polymers.
  • To investigate the effect of long-range polymer chain orientation on transistor performance.
  • To demonstrate high hole mobilities in specifically engineered polymer FETs.

Main Methods:

  • Fabrication of field-effect transistors using high molecular weight (300 kDa) regioregular poly[4-(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b']dithiophen-2-yl)-alt-[1,2,5]thiadiazolo[3,4-c]pyridine].
  • Introduction of long-range polymer chain orientation via short-period annealing.
  • Measurement of charge carrier mobility and transport anisotropy.

Main Results:

  • Achieved hole mobilities of 6.7 cm(2)/(V s) through controlled polymer chain orientation.
  • Demonstrated significant improvement in mobility compared to unoriented polymers.
  • Observed anisotropic transport behavior with mobility approximately 6:1 parallel versus perpendicular to the polymer backbone.

Conclusions:

  • Long-range polymer chain orientation is a critical factor for enhancing charge carrier mobility in conjugated polymer FETs.
  • Short-period annealing is an effective method to achieve this orientation and boost device performance.
  • The anisotropic nature of transport highlights the importance of molecular alignment for efficient charge transport in organic semiconductors.