Printed material constrained by well structures
View Patent ↗A first patterned contact layer, for example a gate electrode, is formed over an insulative substrate. Insulating and functional layers are formed at least over the first patterned contact layer. A second patterned contact layer, for example source/drain electrodes, is formed over the functional layer. Insulative material is then selectively deposited over at least a portion of the second patterned contact layer to form first and second wall structures such that at least a portion of the second patterned contact layer is exposed, the first and second wall structures defining a well therebetween. Electrically conductive or semiconductive material is deposited within the well, for example by jet-printing, such that the first and second wall structures confine the conductive or semiconductive material and prevent spreading and electrical shorting to adjacent devices. The conductive or semiconductive material is in electrical contact with the exposed portion of the second patterned contact layer to form, e.g., an operative transistor.
1. A method of forming an active electronic device comprising:
selectively depositing a first patterned contact layer over a substrate, said first patterned contact layer defining a first electrode of said active device;
depositing a first insulating layer over said first patterned contact layer so as to cover at least said first electrode;
selectively depositing a second patterned contact layer over said first insulating layer, said second patterned contact layer defining second and third electrodes of said active device, at least a portion of each of said second and third electrodes positioned to overlap portions of said first electrode;
depositing a functional layer over said second patterned contact layer;
selectively additively depositing insulating material over at least a portion of said functional layer to form first and second wall structures, said first wall structure positioned to be substantially over said second electrode, said second wall structure positioned to be substantially over said third electrode, and said first and second wall structures substantially not being over said first electrode, said first and second wall structures defining a well region therebetween; and
selectively depositing a semiconductor layer from a solution within said well region such that said first and second wall structures confine said semiconductor layer therein.
2. The method of claim 1 , wherein said functional layer is a hydrophobic coating.
3. The method of claim 2 , wherein said hydrophobic coating is selected from the group consisting of: hydrophobic silane, nonpolar polymer, silazane, polysilsesquioxane, and fluorocarbon.
4. The method of claim 1 , wherein said functional layer is hydrophilic.
5. The method of claim 4 , wherein said hydrophilic functional layer is selected from the group consisting of: hydrophilic silane, polar polymer, polyethylene glycol, polyethylene oxide, and proteins.