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Field Effect Transistor

Field Effect Transistor

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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Updated: Jun 4, 2026

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

Published on: November 7, 2016

Ultrahigh mobility in polymer field-effect transistors by design.

Hoi Nok Tsao¹, Don M Cho, Insun Park

¹Max Planck Institute for Polymer Research, Mainz, Germany.

Journal of the American Chemical Society

|February 5, 2011

Summary

High molecular weight in donor-acceptor copolymers significantly boosts hole mobilities in field-effect transistors (FETs). This research explores polymer design for advanced organic semiconductors with ultrahigh charge carrier performance.

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Last Updated: Jun 4, 2026

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

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Published on: November 7, 2016

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

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Published on: April 12, 2018

Area of Science:

Organic electronics
Materials science
Semiconductor physics

Background:

Donor-acceptor copolymers are crucial for organic electronics.
Optimizing polymer design is key to achieving high charge carrier mobility in field-effect transistors (FETs).
Understanding structure-property relationships is essential for developing advanced organic semiconductors.

Purpose of the Study:

To investigate the impact of molecular weight, alkyl substituents, and donor-acceptor interactions on the performance of cyclopentadithiophene-benzothiadiazole (CDT-BTZ) copolymers.
To correlate polymer design parameters with thin-film morphology, crystallinity, and charge transport properties.
To establish design principles for organic semiconductors with ultrahigh hole mobilities.

Main Methods:

Synthesis and characterization of CDT-BTZ copolymers with varying molecular weights.
Fabrication and electrical characterization of field-effect transistors (FETs).
Analysis of thin-film morphology and crystallinity using techniques like X-ray diffraction.
Solid-state nuclear magnetic resonance (NMR) spectroscopy to probe intermolecular interactions.

Main Results:

Hole mobilities in CDT-BTZ based FETs reached up to 3.3 cm(2) V(-1) s(-1), strongly dependent on molecular weight.
Increased molecular weight led to improved crystallinity without significant changes in thin-film morphology.
Donor-acceptor interactions and alkyl substituents were identified as critical factors influencing intermolecular stacking and charge transport.

Conclusions:

Molecular weight is a primary determinant for achieving ultrahigh hole mobilities in CDT-BTZ copolymers.
Enhanced crystallinity, driven by higher molecular weight, is crucial for improved charge transport.
The findings provide valuable polymer design guidelines for future organic semiconductors targeting mobilities exceeding 3 cm(2) V(-1) s(-1).