Fluorine substitution influence on benzo[2,1,3]thiodiazole based polymers for field-effect transistor applications
AssigneeThe Regents of the University of California
InventorsMing Wang, Guillermo C. Bazan
Life of this patent
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Abstract
Four conjugated copolymers with a donor/acceptor architecture including 4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b′]dithiophene as the donor structural unit and benzo[2,1,3]thiodiazole fragments with varying degrees of fluorination have been synthesized and characterized. It has been shown that the HOMO levels were decreased after the fluorine substitution. The field-effect charge carrier mobility was similar for all polymers with less than an order of magnitude difference between different acceptor units.
Claims27
A composition of matter, comprising:
- one or more semiconducting polymers, each of the one or more semiconducting polymers having a main chain section and a repeating unit of the structure:
- wherein each Ar is independently a substituted or non-substituted aromatic functional group, or each Ar is independently nothing and the valence of its respective ring is completed with hydrogen,
- each R is independently hydrogen or a substituted or non-substituted alkyl, aryl or alkoxy chain;
- and
- X is C, Si, Ge, N or P.
A method of making an organic field effect transistor (OFET), comprising:
- forming a source contact and a drain contact to a channel comprising a plurality of semiconducting polymers;
- forming a gate contact on or above the channel;
- providing a dielectric between the semiconducting polymers and a gate;
- and
- wherein:
- each of the semiconducting polymers have a main chain section and a repeating unit of the structure:
- each Ar is independently a substituted or non-substituted aromatic functional group, or each Ar is independently nothing and the valence of its respective ring is completed with hydrogen,
- each R is independently hydrogen or a substituted or non-substituted alkyl, aryl or alkoxy chain;
- and
- X is C, Si, Ge, N or P.
Dependencies are inferred from the claim text.