Electrical stability is essential for a successful commercialization of organic semiconductor devices. We report
on organic field-effect transistors with unprecedented electrical stability. The single crystal and thin-film transistors
employ a fluorocarbon polymer as gate dielectric (CytopTM) and pentacene or rubrene as the organic
semiconductor. CytopTM (Cyclic Transparent Optical Polymer) is easy to be used and can be deposited in
air from solution. It is highly hydrophobic and has a very low permittivity of ∈i = 2.1 - 2.2. Moreover, the
material is a good electrical insulator with a very high dielectric breakdown field. Its passive surface leads to
extremely stable field-effect transistors with a high field-effect mobility, an outstanding subthreshold swing as low
as 0.75 nFV/(decade cm2) and a near zero onset voltage. Of particular significance is the resistance of the devices
against long-term gate bias stress. Oligomeric organic semiconductors can have a very high electrical stability
when combined with a suitable gate dielectric. CytopTM is an ideal gate dielectric for organic electronics and
it seems very likely that the material leads to outstanding transistors in combination with many small molecule
organic semiconductors.
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