High performance nanocomposite thin film transistors with bilayer carbon nanotube-polythiophene active channel by ink-jet printing

被引：40

作者：

Hsieh, Gen-Wen ^{[1
]}

Li, Flora M. ^{[1
]}

Beecher, Paul ^{[2
]}

Nathan, Arokia ^{[3
]}

Wu, Yiliang ^{[4
]}

Ong, Beng S. ^{[5
]}

Milne, William I. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Engn, Cambridge CB3 0FA, England

[2] Univ Cambridge, Nanosci Ctr, Nokia Res Ctr, Cambridge CB3 0FF, England

[3] UCL, London Ctr Nanotechnol, London WC1H 0AH, England

[4] Xerox Res Ctr Canada Ltd, Mississauga, ON L5K 2L1, Canada

[5] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

来源：

JOURNAL OF APPLIED PHYSICS | 2009年 / 106卷 / 12期

关键词：

carbon nanotubes; conducting polymers; filled polymers; nanocomposites; organic semiconductors; semiconductor thin films; thin film transistors; FIELD-EFFECT TRANSISTORS; CHARGE-TRANSPORT; COMPOSITES; PENTACENE; POLYMERS;

D O I：

10.1063/1.3273377

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Nanocomposite thin film transistors (TFTs) based on nonpercolating networks of single-walled carbon nanotubes (CNTs) and polythiophene semiconductor [poly[5,5(')-bis(3-dodecyl-2-thienyl)-2,2(')-bithiophene] (PQT-12)] thin film hosts are demonstrated by ink-jet printing. A systematic study on the effect of CNT loading on the transistor performance and channel morphology is conducted. With an appropriate loading of CNTs into the active channel, ink-jet printed composite transistors show an effective hole mobility of 0.23 cm(2) V-1 s(-1), which is an enhancement of more than a factor of 7 over ink-jet printed pristine PQT-12 TFTs. In addition, these devices display reasonable on/off current ratio of 10(5)-10(6), low off currents of the order of 10 pA, and a sharp subthreshold slope (< 0.8 V dec(-1)). The work presented here furthers our understanding of the interaction between polythiophene polymers and nonpercolating CNTs, where the CNT density in the bilayer structure substantially influences the morphology and transistor performance of polythiophene. Therefore, optimized loading of ink-jet printed CNTs is crucial to achieve device performance enhancement. High performance ink-jet printed nanocomposite TFTs can present a promising alternative to organic TFTs in printed electronic applications, including displays, sensors, radio-frequency identification (RFID) tags, and disposable electronics.

引用

页数：7

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