High performance pentacene organic field-effect transistors consisting of biocompatible PMMA/silk fibroin bilayer dielectric

doi:10.1088/1674-1056/23/3/038505

Abstract Pentacene organic field-effect transistors (OFETs) based on single-or double-layer biocompatible dielectrics of poly(methyl methacrylate) (PMMA) and/or silk fibroin (SF) are fabricated. Compared with those devices based on single PMMA or SF dielectric or SF/PMMA bilayer dielectric, the OFETs with biocompatible PMMA/SF bilayer dielectric exhibit optimal performance with a high field-effect mobility of 0.21 cm²/Vs and a current on/off ratio of 1.5×10⁴. By investigating the surface morphology of the pentacene active layer through atom force microscopy and analyzing the electrical properties, the performance enhancement is mainly attributed to the crystallization improvement of the pentacene and the smaller interface trap density at the dielectric/organic interface. Meanwhile, a low contact resistance also indicates that a good electrode/organic contact is formed, thereby assisting the performance improvement of the OFET.

Keywords: organic filed-effect transistors (OFETs) poly(methyl methacrylate) silk fibroin bilayer dielectric

Received: 06 July 2013
Revised: 01 August 2013
Accepted manuscript online:

PACS:	85.30.Tv	(Field effect devices)
	85.50.-n	(Dielectric, ferroelectric, and piezoelectric devices)
	68.35.-p	(Solid surfaces and solid-solid interfaces: structure and energetics)
	73.40.Cg	(Contact resistance, contact potential)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61177032), the Foundation for Innovation Groups of the National Natural Science Foundation of China (Grant No. 61021061), the Fundamental Research Funds for the Central Universities, China (Grant No. ZYGX2010Z004), and the Scientific Research Staring Foundation for the Returned Overseas Chinese Scholars of the Education Ministry of China (Grant No. GGRYJJ08-05).

Corresponding Authors: Yu Jun-Sheng
E-mail: jsyu@uestc.edu.cn

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Li Hai-Qiang (李海强), Yu Jun-Sheng (于军胜), Huang Wei (黄伟), Shi Wei (施薇), Huang Jiang (黄江) High performance pentacene organic field-effect transistors consisting of biocompatible PMMA/silk fibroin bilayer dielectric 2014 Chin. Phys. B 23 038505

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High performance pentacene organic field-effect transistors consisting of biocompatible PMMA/silk fibroin bilayer dielectric

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