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 copolymer comprising repeating units of formula (VII)
wherein
A is a group of formula
COM 1 is a group of formula
a is an integer of 1 and 3 to 5,
n is number which results in a molecular weight of 10,000 to 1,000,000 Daltons,
Ar 1 and Ar 1′ are a group of formula
Ar 2 is a group of formula
and
R 1 and R 2 are the same or different and are selected from a branched C 8 -C 36 alkyl group.
2. The copolymer according to claim 1 , wherein a is an integer of 1 and 3.
3. A copolymer comprising repeating units of formula (IIa′)
R 1 and R 2 are the same or different and are selected from a branched C 8 -C 36 alkyl group.
4. The copolymer according to claim 1 , which has a weight average molecular weight of 10,000 to 100,000 Daltons.
5. A semiconductor device comprising the copolymer according to claim 1 .
6. The semiconductor device according to claim 5 is an organic field effect transistor.
7. An integrated circuit comprising the organic field effect transistor according to claim 6 .
8. A semiconductor device comprising a polymer according to claim 3 .
9. The copolymer according to claim 3 , wherein R 1 and R 2 are selected from a branched C 12 -C 24 alkyl group.
10. The copolymer according to claim 1 , wherein R 1 and R 2 are the same or different and are selected from 2-hexyldecyl and decyl-tetradecyl.
11. The copolymer according to claim 3 , wherein R 1 and R 2 are the same or different and are selected from 2-hexyldecyl and decyl-tetradecyl.
12. The copolymer according to claim 1 , wherein n is a number which results in a molecular weight of 20,000 to 60,000 Daltons.
13. The copolymer according to claim 3 , wherein n is a number which results in a molecular weight of 20,000 to 60,000 Daltons.
14. The copolymer according to claim 1 having a structure
15. A copolymer comprising repeating units of formula (VII)
wherein
A is a group of formula
COM 1 is a group of formula
a is an integer of 1 and 3 to 5,
n is number which results in a molecular weight of 10,000 to 1,000,000 Daltons,
Ar 1 and Ar 1′ are a group of formula
Ar 2 is a group of formula
and
R 1 and R 2 are the same or different and are selected from a branched C 12 -C 24 alkyl group.
16. The copolymer according to claim 15 , wherein a is an integer of 1 and 3.
17. The copolymer according to claim 15 , which has a weight average molecular weight of 10,000 to 100,000 Daltons.
18. A semiconductor device comprising the copolymer according to claim 15 .
19. The semiconductor device according to claim 18 is an organic field effect transistor.
20. An integrated circuit comprising the organic field effect transistor according to claim 19 .