Diketopyrrolopyrrole polymers for use in organic field effect transistors
The present invention relates to polymers comprising a repeating unit of the formula I, or III and their use as organic semiconductor in organic devices, especially an organic field effect transistor (OFET), or a device containing a diode and/or an organic field effect transistor. The polymers according to the invention have excellent solubility in organic solvents and excellent film-forming properties. In addition, high efficiency of energy conversion, excellent field-effect mobility, good on/off current ratios and/or excellent stability can be observed, when the polymers according to the invention are used in organic field effect transistors.
1. A polymer comprising repeating units of the formula
wherein
a is an integer of 1 to 5,
R 1 and R 2 may be the same or different and are a branched C 8 -C 36 alkyl group.
2. The polymer according to claim 1 consisting of repeating units of the formula
wherein
a is an integer of 1 to 5, and
R 1 and R 2 may be the same or different and are a branched C 8 -C 36 alkyl group.
3. The polymer according to claim 1 comprising repeating units of the formula
wherein
R 1 and R 2 may be the same or different and are selected from a branched C 8 -C 36 alkyl group.
4. The polymer according to claim 3 consisting of repeating units of the formula
wherein
R 1 and R 2 may be the same or different and are selected from a branched C 8 -C 36 alkyl group.
5. The polymer according to claim 1 wherein a is an integer of 1 to 3.
6. The polymer according to claim 1 wherein R 1 and R 2 are a branched C 12 -C 24 alkyl group.
7. The polymer according to claim 3 , comprising repeating units of the formula
wherein
R 1 and R 2 may be the same or different and are selected from a branched C 8 -C 36 alkyl group.
8. The polymer according to claim 3 consisting of repeating units of the formula
wherein
R 1 and R 2 may be the same or different and are selected from a branched C 8 -C 36 alkyl group.
9. An organic semiconductor material, layer, or component comprising the polymer according to claim 1 .
10. A semiconductor device comprising the polymer according to any of claim 1 .
11. The semiconductor device according to claim 10 which is an organic field effect transistor (OFET).
12. A semiconductor device comprising an organic semiconductor material, layer, or component according to claim 9 .
13. The semiconductor device according to claim 12 which is an organic field effect transistor (OFET).
14. A process for the preparation of an organic semiconductor device, comprising applying a solution and/or dispersion of a polymer according to claim 1 in an organic solvent to a suitable substrate and removing the solvent.
15. An integrated circuit comprising an organic field effect transistor according to claim 11 .