High optical transparent two-dimensional electronic conducting system and process for generating same
Hybrid transparent conducting materials are disclosed which combine a polycrystalline film and conductive nanostructures, in which the polycrystalline film is “percolation doped” with the conductive nanostructures. The polycrystalline film preferably is a single atomic layer thickness of polycrystalline graphene, and the conductive nanostructures preferably are silver nanowires.
1. A method for forming a hybrid film for a transparent conducting electrode, the method comprising:
depositing a single-layer polycrystalline graphene film on an intermediate substrate;
transferring the single-layer polycrystalline graphene film onto a transparent substrate; and
randomly dispersing conductive nanowires on the single-layer polycrystalline graphene film to form a stack in which the single-layer polycrystalline graphene film is positioned between the randomly dispersed conductive nanowires and the transparent substrate.
2. The method of claim 1 , wherein the transparent substrate comprises quartz.
3. The method of claim 1 , wherein the transparent substrate comprises polyethylene terephthalate.
4. The method of claim 1 , wherein the intermediate substrate comprises copper foil, and wherein the method further comprising removing the copper foil from the single-layer polycrystalline graphene film by etching in an iron nitrate solution.
5. The method of claim 1 , further comprising:
coating the single-layer polycrystalline graphene film with a carrier layer;
removing the intermediate substrate from the single-layer polycrystalline graphene film after coating the single-layer polycrystalline graphene film with the carrier layer;
using the carrier layer to transfer the single-layer polycrystalline graphene film onto the quartz substrate; and
removing the carrier layer prior to randomly dispersing the conductive nanowires on the single-layer polycrystalline graphene film.
6. The method of claim 5 , wherein the carrier layer comprises poly(methyl methacrylate).
7. The method of claim 1 , wherein the conductive nanowires are silver nanowires having diameters between 70-110 nanometers and lengths between 20-60 micrometers.
8. The method of claim 1 , wherein randomly dispersing the conductive nanowires on the single-layer polycrystalline graphene film comprises drop casting a suspension comprising the conductive nanowires dispersed in isopropyl alcohol.
9. The method of claim 8 , wherein the suspension includes 0.1 milligrams of the conductive nanowires per milliliter of the isopropyl alcohol.
10. The method of claim 1 , further comprising annealing the stack.
11. A method for forming a hybrid film for a transparent conducting electrode, the method comprising:
depositing a single-layer polycrystalline graphene film on an intermediate substrate;
randomly dispersing conductive nanowires on a transparent substrate; and
transferring the single-layer polycrystalline graphene film onto the conductive nanowires and the transparent substrate to form a stack in which the randomly dispersed conductive nanowires are positioned between the single-layer polycrystalline graphene film and the transparent substrate.
12. The method of claim 11 , wherein the transparent substrate comprises quartz.
13. The method of claim 11 , wherein the transparent substrate comprises polyethylene terephthalate.
14. The method of claim 11 , wherein the intermediate substrate comprises copper foil, and wherein the method further comprising removing the copper foil from the single-layer polycrystalline graphene film by etching in an iron nitrate solution.
15. The method of claim 11 , further comprising:
coating the single-layer polycrystalline graphene film with a carrier layer;
removing the intermediate substrate from the single-layer polycrystalline graphene film after coating the single-layer polycrystalline graphene film with the carrier layer; and
using the carrier layer to transfer the single-layer polycrystalline graphene film onto the conductive nanowires and the quartz substrate.
16. The method of claim 15 , wherein the carrier layer comprises poly(methyl methacrylate).
17. The method of claim 11 , wherein the conductive nanowires are silver nanowires having diameters between 70-110 nanometers and lengths between 20-60 micrometers.
18. The method of claim 11 , wherein randomly dispersing the conductive nanowires on the single-layer polycrystalline graphene film comprises drop casting a suspension comprising the conductive nanowires dispersed in isopropyl alcohol.
19. The method of claim 18 , wherein the suspension includes 0.1 milligrams of the conductive nanowires per milliliter of the isopropyl alcohol.
20. The method of claim 11 , further comprising annealing the stack.