期刊
SYNTHETIC METALS
卷 157, 期 13-15, 页码 551-557出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2007.06.002
关键词
organic heterojunction; phthalocyanine; TCNQ; field-effect transistors
Heterojunction organic field-effect transistors (OTFTs) based on copper phthalocyanine (CuPc) as p-type and on copper hexadecafluorophthalocyanine (F16CuPc) or 7,7,8,8-tetracyano-p-quinodimethane (TCNQ) as n-types were fabricated and studied. They were shown to operate in unipolar mode where hole current was recorded with values approaching those of CuPc-based single-layer device. However, due to a charge transfer phenomenon between CuPc and F16CuPc, the occurrence of a build-in electrical field at the CuPc/F16CuPc interface is shown to influence the transport properties at low drain-source voltages and to induce a non-ideal ohrnic behavior in OTFT characteristics. This effect is not observed in the case of CuPc/TCNQ because of a larger energy difference between HOMO and LUMO energy levels of CuPc and TCNQ, respectively. (C) 2007 Elsevier B.V. All rights reserved.
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