An Amorphous Polythiophene as a Binder Material for Organic Thin-Film Transistor Channel Applications
- 13 April 2010
- journal article
- research article
- Published by Informa UK Limited in Molecular Crystals and Liquid Crystals
- Vol. 519 (1), 179-186
- https://doi.org/10.1080/15421401003613675
Abstract
Blending of crystalline low molecular-weight organic semiconductors, e.g., 6,13-bis (triisopropylsilylethynyl)pentacene (TIPS-Pentacene), and binder polymers has recently been known to be an effective way to achieve high performance organic thin-film transistors (OTFTs). However, only limited number of examples has been reported as binder materials for OTFT applications, e.g., poly(triarylamine), poly(α-methylstyrene), and etc. In this work, an amorphous polythiophene derivative, poly(3-(2-ethylhexyl)thiophene) (P3EHT), was prepared by introducing 2-ethylhexyl group as a side-chain to the polythiophene. The P3EHT was synthesized by Grignard metathesis (GRIM) polymerization to give a molecular weight (Mn) of 4,100 (PDI = 3.4), and it was readily soluble in common organic solvents, such as chloroform, tetrahydrofuran, toluene, and etc. An amorphous nature of the P3EHT was confirmed from differential scanning calorimetry (DSC) and ultraviolet-visible spectroscopy results. A mobility of 2.5 × 10−4 cm2/Vs, an on/off ratio of 0.57 × 103 and a threshold voltage of 1.6 V have been obtained with OTFTs using a P3EHT/TIPS-Pentacene blend.Keywords
This publication has 13 references indexed in Scilit:
- Synthesis of Polythiophenes with Electron-Donating Side-Chain and their Application to Organic Thin-Film TransistorsMolecular Crystals and Liquid Crystals, 2009
- High‐Performance Polymer‐Small Molecule Blend Organic TransistorsAdvanced Materials, 2009
- Organic thin film transistors using 6,13-bis(tri-isopropylsilylethynyl)pentacene embedded into polymer bindersApplied Physics Letters, 2009
- Structure and Properties of Small Molecule−Polymer Blend Semiconductors for Organic Thin Film TransistorsJournal of the American Chemical Society, 2008
- Thiophene Polymer Semiconductors for Organic Thin‐Film TransistorsChemistry – A European Journal, 2008
- Organic Semiconductors for Solution‐Processable Field‐Effect Transistors (OFETs)Angewandte Chemie-International Edition, 2008
- Organic field effect transistors from ambient solution processed low molar mass semiconductor–insulator blendsJournal of Materials Chemistry, 2008
- The Larger Acenes: Versatile Organic SemiconductorsAngewandte Chemie-International Edition, 2007
- Synthesis of New Thiophene-Based π-Conjugated Polymers for Investigation of Molecular Alignment on the Surface of Platinum PlateMacromolecules, 2006
- A Simple Method to Prepare Head-to-Tail Coupled, Regioregular Poly(3-alkylthiophenes) Using Grignard MetathesisAdvanced Materials, 1999