Solution process for fabricating high-performance organic thin-film transistors
First Claim
1. An organic thin film transistor (OTFT) device having an organic semiconductor channel, the OTFT device comprising:
- a substrate and an organic semiconductor channel on the substrate, wherein the organic semiconductor channel comprises an organic semiconductor crystallized within a mediating polymer, wherein the organic semiconductor comprises a diketopyrrolopyrrole-based polymer and the mediating polymer is selected from polyacrylonitrile, polystyrene, poly(methyl methacrylate), poly(methyl methacrylate-alt-styrene), polyvinyl chloride, or a mixture thereof wherein a percentage ratio by weight of organic semiconductor;
mediating polymer ranges from 5;
95 to 95;
5;
wherein the OTFT device has a field effect mobility of greater than or equal to 2 cm2V−
1s−
1 and a current on/off ratio of greater than or equal to 105.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to a solution or ink composition for fabricating high-performance thin-film transistors. The solution or ink comprises an organic semiconductor and a mediating polymer such as polyacrylonitrile, polystyrene, or the like or mixture thereof, in an organic solvent such as chlorobenzene or dichlorobenzene. The percentage ratio by weight of semiconductor: mediating polymer ranges from 5:95 to 95:5, and preferably from 20:80 to 80:20. The solution or ink is used to fabricate via solution coating or printing a semiconductor film, followed by drying and thermal annealing if necessary to provide a channel semiconductor for organic thin-film transistors (OTFTs). The resulting OTFT device with said channel semiconductor has afforded OTFT performance, particularly field-effect mobility and current on/off ratio that are superior to those OTFTs with channel semiconductors fabricated without a mediating polymer.
1 Citation
13 Claims
-
1. An organic thin film transistor (OTFT) device having an organic semiconductor channel, the OTFT device comprising:
-
a substrate and an organic semiconductor channel on the substrate, wherein the organic semiconductor channel comprises an organic semiconductor crystallized within a mediating polymer, wherein the organic semiconductor comprises a diketopyrrolopyrrole-based polymer and the mediating polymer is selected from polyacrylonitrile, polystyrene, poly(methyl methacrylate), poly(methyl methacrylate-alt-styrene), polyvinyl chloride, or a mixture thereof wherein a percentage ratio by weight of organic semiconductor;
mediating polymer ranges from 5;
95 to 95;
5;wherein the OTFT device has a field effect mobility of greater than or equal to 2 cm2V−
1s−
1 and a current on/off ratio of greater than or equal to 105. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. An organic thin-film transistor device having at least one organic channel semiconductor fabricated by:
-
dissolving at least one organic semiconductor comprising a diketopyrrolopyrrole-based polymer and at least one hydrocarbon binder in at least one solvent to produce a solution; coating or printing said solution on a substrate to produce a coated substrate; and drying said coated substrate at room temperature to produce a channel semiconductor. - View Dependent Claims (8, 9, 10, 11, 12, 13)
-
Specification