Res. Chem. Intermed.
, Vol. 34, No. 2–3, pp. 147–153 (2008)
Koninklijke Brill NV, Leiden, 2008.
Also available online - www.brill.nl/rci
Air-stable ambipolar ﬁeld-effect transistors based on
copper phthalocyanine and tetracyanoquinodimethane
, HONGXIANG LI
, YABIN SONG
and DAOBEN ZHU
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids,
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China
Graduate School of Chinese Academy of Sciences, Beijing 100039, P. R. China
Abstract—The fabrication of air-stable ambipolar organic ﬁeld-effect transistors with sandwich-
type and bilayer architecture based on copper phthalocyanine and 7,7,8,8-tetracyanoquinodimethane
is reported. In comparison with bilayer devices, the sandwich-type conﬁguration enhances the
performance and reproducibility of ambipolar devices, which is mainly ascribed to the double
conductive channels in the sandwich-type structure. The measured p-channel and n-channel mo-
bility of sandwich-type devices are comparable to that of copper phthalocyanine and 7,7,8,8-
tetracyanoquinodimethane single layer devices, respectively.
Keywords: Organic thin ﬁlm transistor; ambipolarity; sandwich; copper phthalocyanine; tetra-
The appealing prospect that organic ﬁeld-effect transistors (OFETs) will be ex-
tensively used in electronic devices has been envisioned and demonstrated .
Nevertheless, it is known that most of OFETs show unipolar conduction. From
the standpoint of practical application, an efﬁcient strategy to construct integrated
circuits is the employment of complementary metal–oxide–semiconductor (CMOS)
technology based on ambipolar ﬁeld-effect transistors (FETs) . To date, a va-
riety of ambipolar OFETs have been constructed by various methods such as
single-component , heterogeneous blends [2, 4, 5] and laminated heterostruc-
ture [6–12]. However, similar to the n-channel devices, one of the main obstacles
of ambipolar OFETs is the stability. Up to date, the number of air-stable ambipolar
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