Related Experiment Video
Updated: Sep 23, 2025

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
Published on: November 7, 2016
Effect of fluorination of naphthalene diimide-benzothiadiazole copolymers on ambipolar behavior in field-effect
Cunbin An1, Hanna Makowska1,2, Benlin Hu1
1Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany martin.baumgarten@mpip-mainz.mpg.de.
Abstract:
Two naphthalene diimide (NDI)-benzothiadiazole (BT) based conjugated polymers with high molecular weight, P1 and P2, were synthesized by introducing F atoms to modulate the electron-donating ability of the BT moiety. 3-Decyl-pentadecyl branched alkyl side chains were employed and expected to improve the molecular organization and device performance. Both polymers have excellent solubility in common organic solvents. UV-vis-NIR absorption and cyclic voltammetry indicate that the maximum absorption wavelength of P2 is blue-shifted and the HOMO energy level of P2 is decreased in comparison with P1. Two dimensional wide angle X-ray scattering of thin films revealed a similar organization of both polymers. A less balanced transport in field-effect transistors with increased electron mobility of 0.258 cm2 V-1 s-1 and lowered hole transport of 2.4 × 10-3 cm2 V-1 s-1 was found for P2. Polymer devices of P1 exhibited a balanced ambipolar transport, with a hole mobility of 0.073 cm2 V-1 s-1 and electron mobility of 0.086 cm2 V-1 s-1.
Related Concept Videos
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
Biasing of FET
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
Field Effect Transistor
Molecular Shape and Polarity
π Electron Effects on Chemical Shift: Overview

