FORMING VERTICALLY SPACED ELECTRODES
Producing vertically separated electrodes includes providing a structural polymer layer on a substrate. A patterned inorganic thin film is formed on the structural polymer layer, leaving exposed portions of the structural polymer layer not under the inorganic thin film. The exposed portions of the structural polymer layer and portions of the structural polymer layer between the patterned inorganic thin film and the substrate are removed to form a structural polymer post having an inorganic cap that extends beyond an edge of the structural polymer post to define a reentrant profile. A polymeric inhibitor is provided in the reentrant profile. A conductive inorganic thin film is deposited where the polymeric inhibitor is absent using an atomic layer deposition process to form a first electrode located over the cap and a second electrode over the substrate and not over the post.
1 . A method of producing vertically separated electrodes:
providing a substrate;
providing a structural polymer layer on the substrate;
forming a patterned inorganic thin film on the structural polymer layer, leaving exposed portions of the structural polymer layer not under the inorganic thin film;
removing the exposed portions of the structural polymer layer and portions of the structural polymer layer between the patterned inorganic thin film and the substrate to form a structural polymer post having an inorganic cap that extends beyond an edge of the structural polymer post to define a reentrant profile;
providing a polymeric inhibitor in the reentrant profile; and
depositing a conductive inorganic thin film where the polymeric inhibitor is absent using an atomic layer deposition process to form a first electrode located over the cap and a second electrode over the substrate and not over the post.
2 . The method of claim 1 , wherein using an atomic layer deposition process includes using a spatial atomic layer deposition process.
3 . The method of claim 1 , the structural polymer layer having a surface, further comprising treating the surface of the structural polymer layer to activate the surface of the polymer to facilitate inorganic thin film growth using an atomic layer deposition process.
4 . The method of claim 1 , wherein providing a polymeric inhibitor includes providing the polymeric inhibitor using a coating process or a printing process.
5 . The method of claim 4 , wherein the printing process includes an inkjet printing process or a flexographic printing process.
6 . The method of claim 1 , wherein providing a polymeric inhibitor includes providing a water soluble polymer.
7 . The method of claim 6 , wherein providing a water soluble polymer includes providing polyvinylpyrrolidone.
8 . The method of claim 1 , wherein providing the structural polymer layer comprises providing polyester, polyetherester, polyamide, polyesteramide, polyurethane, polyimide, polyetherimide, polyurea, polyamideimide, polyphenyleneoxide, phenoxy resin, epoxy resin, polyolefin, polyacrylate, polyethylene-co-vinyl alcohol, or a copolymer thereof, or a mixture thereof.
9 . The method of claim 1 , wherein providing the structural polymer layer comprises providing an epoxy resin or polyimide layer.
10 . The method of claim 1 , wherein removing the exposed portions of the structural polymer layer and portions of the structural polymer layer between the patterned inorganic thin film and the substrate includes using a plasma process or UV-ozone process.
11 . The method of claim 1 , wherein forming a patterned inorganic thin includes depositing one of a Al 2 O 3 , SiO 2 , HfO, ZrO, TiO 2 , Ta 2 O 5 , and Si x N y .
12 . The method of claim 1 , wherein forming the structural polymer post having the inorganic cap further includes forming another reentrant profile opposite the reentrant profile.
13 . The method of claim 12 , wherein forming the first electrode includes forming the first electrode to extend beyond the other reentrant profile.
14 . The method of claim 12 , further comprising depositing a filler material in the other reentrant profile.