Air-stable ambipolar organic field effect transistors with heterojunction of pentacene and N,N'-bis(4-trifluoromethylben-zyl)perylene-3,4,9,10-tetracarboxylic diimide
Li Jian-Feng(李建丰)a)b), Chang Wen-Li(常文利)b), Ou Gu-Ping(欧谷平)a), and Zhang Fu-Jia(张福甲)a)†
a Department of Physics, Lanzhou University, Lanzhou 730000, China; b School of Mathematics, Physics & Software Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Abstract Fabrication of ambipolar organic field-effect transistors (OFETs) is essential for the achievement of an organic complementary logic circuit. Ambipolar transports in OFETs with heterojunction structures are realized. We select pentacene as a P-type material and N,N'-bis(4-trifluoromethylben-zyl)perylene-3,4,9,10-tetracarboxylic diimide (PTCDI-TFB) as a n-type material in the active layer of the OFETs. The field-effect transistor shows highly air-stable ambipolar characteristics with a field-effect hole mobility of 0.18 cm2/(V$\cdot$s) and field-effect electron mobility of 0.031 cm2/(V$\cdot$s). Furthermore the mobility only slightly decreases after being exposed to air and remains stable even for exposure to air for more than 60 days. The high electron affinity of PTCDI-TFB and the octadecyltrichlorosilane (OTS) self-assembly monolayer between the SiO2 gate dielectric and the organic active layer result in the observed air-stable characteristics of OFETs with high mobility. The results demonstrate that using the OTS as a modified gate insulator layer and using high electron affinity semiconductor materials are two effective methods to fabricate OFETs with air-stable characteristics and high mobility.
Received: 02 October 2008
Revised: 24 December 2008
Accepted manuscript online:
Fund: Project supported by
the National Natural Science Foundation of China (Grant Nos 60676033
and 60276026), the Natural Science Foundation of Gansu Province,
China (Grant No ZS031-A25-012-G), and `Qing Lan' Talent Engineering
Funds from Lanzhou Jiaotong University, China (Grant No QL-08-18A).
Cite this article:
Li Jian-Feng(李建丰), Chang Wen-Li(常文利), Ou Gu-Ping(欧谷平), and Zhang Fu-Jia(张福甲) Air-stable ambipolar organic field effect transistors with heterojunction of pentacene and N,N'-bis(4-trifluoromethylben-zyl)perylene-3,4,9,10-tetracarboxylic diimide 2009 Chin. Phys. B 18 3002
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