n-Type thiophene semiconductors
AssigneeNorthwestern University
InventorsTobin J. Marks, Antonio Facchetti
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Abstract
The new fluorocarbon-functionalized and/or heterocycle-modified polythiophenes, in particular, α,ω-diperfluorohexylsexithiophene DFH-6T can be straightforwardly prepared in high yield and purity. Introduction of such modifications to a thiophene core affords enhanced thermal stability and volatility, and increased electron affinity versus the unmodified compositions of the prior art. Evaporated films behave as n-type semiconductors, and can be used to fabricate thin film transistors with FET mobilities ˜0.01 cm2/Vs—some of the highest reported to date for n-type organic semiconductors.
Claims6
A method of using thiophene structural modification to promote n-type thiophene conductivity;
- said method comprising:
- preparing a polythiophene composition, said composition comprising a plurality of conjugated thiophene moieties;
- and
- providing said composition a structural modification sufficient to promote n-type conductivity, wherein said structurally modified composition has the structure
- wherein R1, R2 and R3 are selected from the substituent group consisting of fluoroalkyl moieties, CnH2n+1 and where n is 1 to about 12, H, F and (CH2)aX and where a is 1 to about 12 and X is selected from the group consisting of amino, hydroxy and carboxylic acid functionalities;
- and x, y and z are integers selected from the group of integers consisting of 1 and integers greater than 1.
Dependencies are inferred from the claim text.