n-type thiophene semiconductors
AssigneesNorthwestern University, Cambridge Univ. Technical Services, Ltd.
InventorsTobin J. Marks, Antonio Facchetti, Henning Sirringhaus, Richard H. Friend
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Abstract
The new fluorocarbon-functionalized polythiophenes, in particular, α,ω-diperfluorohexylsexithiophene DFH-6T (1) can be straightforwardly prepared in high yield and purified by gradient sublimation. Introduction of perfluorocarbon chains on the thiophene core affords enhanced thermal stability and volatility, and increased electron affinity versus the fluorine-free analog 2. Evaporated films of 1, for example, behave as n-type semiconductors, and can be used to fabricate thin film transistors with FET mobilities on the order of ˜0.01 cm2/Vs—some of the highest reported to date for n-type organic semiconductors.
Claims32
A field effect transistor device, comprising:
- a gate electrode;
- a source electrode and a drain electrode;
- and
- an n-type conjugated organic semiconducting material between said source and drain electrodes and in electrical contact therewith, comprising at least one side chain that contains a fluoroalkyl group.
A complementary logic circuit containing organic transistor devices as in any of the preceding claims.
A method of using an organic semiconductor material for n-type conduction in a field effect transistor, said method comprising:
- providing a field effect transistor device having a gate electrode;
- providing source and drain electrodes with an n-type semiconductor material therebetween and in electrical contact therewith, said n-type semiconductor material comprising a fluoroalkyl-substituted composition;
- and
- operating said transistor for conduction with said composition to provide a positive source-drain current.
A complementary organic transistor circuit containing n- and p-type transistors in which the chemical structure of the n-type semiconducting material differs from that of the p-type semiconducting material only by the replacement of at least one alkyl side chain by a fluoroalkyl side chain.
A junction field-effect transistor in which the chemical structure of the n-type semiconducting material differs from that of the p-type semiconducting material only by the replacement of at least one alkyl side chain by a fluoroalkyl side chain.
Dependencies are inferred from the claim text.