Solar cell superfine electrode transfer thin film

Abstract

A solar cell superfine electrode transfer thin film is described. The electrode transfer thin film sequentially includes from bottom to top a substrate, a release layer, a resin layer and a hot melt adhesive layer; the resin layer is formed with electrode trenches therein; the electrode trenches are formed with electrodes therein; superfine conductive electrodes are continuously prepared on a transparent thin film via a roll-to-roll nanoimprinting method, the width of an electrode wire being 2 μm-50 μm, and the width of a typical line being 10 μm-30 μm. Directly attach the superfine electrodes of the hot melt adhesive layer to a solar cell by peeling off the substrate material, and sintering at a high temperature to volatilize the hot melt adhesive layer material while retaining the electrodes, thus the electrodes are integrally transferred, without poor local transfer.

We claim: 
     
         1 . A hyperfine electrode transfer film for a solar battery, the electrode transfer film comprising:
 a hot-melt adhesive layer;   a resin layer, the resin layer disposed on top of the hot-melt adhesive layer, the resin layer including electrode trenches formed therein, wherein the resin layer is made of UV photosensitive resin, electrodes are further formed in the electrode trenches already formed in the resin layer;   a substrate; and   a release layer disposed on top of the substrate and covering an entire surface of the substrate, wherein the release layer is formed by performing a plasma process or a fluoridization process on a plastic film or a paper, or applying a silicon release agent on a surface of a film material allowing a surface separability of the release layer from the resin layer.   
     
     
         2 . The hyperfine electrode transfer film as recited in  claim 1 , wherein the electrode trenches and the electrodes have a comb-like structure or a honeycomb structure corresponding to the solar battery. 
     
     
         3 . The hyperfine electrode transfer film as recited in  claim 1 , wherein the electrodes are made of a mixed material of glass microsphere frit and electroconduction slurry. 
     
     
         4 . The hyperfine electrode transfer film as recited in  claim 1 , wherein the release layer has a thickness between 0.5 μm and 1.2 μm, and the hot-melt adhesive layer has a thickness between 0.5 μm and 2.0 μm. 
     
     
         5 . The hyperfine electrode transfer film as recited in  claim 1 , wherein each of the electrode trenches has a linewidth between 2 μm and 50 μm and a depth between 2 μm and 60 μm. 
     
     
         6 . The hyperfine electrode transfer film as recited in  claim 5 , wherein each of the electrode trenches has a linewidth between 10 μm and 30 μm. 
     
     
         7 . The hyperfine electrode transfer film as recited in  claim 1 , wherein the release layer is formed by performing a plasma process or a fluoridization process on the plastic film or the paper, or applying a silicon release agent on a surface of a film material. 
     
     
         8 . The hyperfine electrode transfer film as recited in  claim 7 , wherein there is no stickiness or slight stickiness between the release layer and the resin layer contacted under a limited condition. 
     
     
         9 . The hyperfine electrode transfer film as recited in  claim 8 , wherein the electrode trenches are formed by imprinting on the resin layer with a convex mold corresponding to an electrode structure, wherein a linewidth and a depth of each of the electrode trenches are adjusted based on a requirement for electrode electroconductivity. 
     
     
         10 . The hyperfine electrode transfer film as recited in  claim 8 , wherein each of the electrodes in one of the electrode trenches is filled with a mixed material of glass frit and electroconduction slurry, wherein the electrodes do not extend to the release layer. 
     
     
         11 . The hyperfine electrode transfer film as recited in  claim 8 , wherein the hot-melt adhesive layer is volatilized after being sintered at a high temperature, to fuse the electrodes to a surface of the solar battery. 
     
     
         12 . The hyperfine electrode transfer film as recited in  claim 11 , wherein the hot-melt adhesive layer is attached to an anti-reflection layer on a surface of the solar battery. 
     
     
         13 . The hyperfine electrode transfer film as recited in  claim 12 , wherein the hot-melt adhesive layer and the anti-reflection layer are boned via a heating process. 
     
     
         14 . The hyperfine electrode transfer film as recited in  claim 13 , wherein the hot-melt adhesive layer is sintered at a high temperature to be volatilized to fuse the electrodes to the surface of the solar battery. 
     
     
         15 . A method for producing a hyperfine electrode transfer film for a solar battery, the method comprising:
 providing a substrate;   applying a release layer on the substrate, wherein the release layer covers an entire surface of the substrate, the release layer is formed by performing a plasma process or a fluoridization process on a plastic film, a piece of paper, or applying a silicon release agent on a surface of a film material;   applying a resin layer on the release layer, the resin layer made of a type of photosensitive resin, and   forming a plurality of electrode trenches by imprinting in the resin layer with a mold corresponding to an electrode structure, wherein a linewidth or a depth of each of the electrode trenches is adjusted based on a requirement for electrode electroconductivity;   growing a plurality of electrodes, each of the electrodes in one of the electrode trenches, by filling the one of the electrode trenches with a mixed material of glass frit and electroconduction slurry, wherein the electrodes do not extend to the release layer; and   applying a hot-melt adhesive layer on the electrodes, wherein the hot-melt adhesive layer covering an entire surface of the resin layer is volatilized after being sintered at a high temperature, to fuse the electrodes to a surface of the solar battery.   
     
     
         16 . The method according to  claim 15 , further comprising:
 attaching the hot-melt adhesive layer to an anti-reflection layer on the surface of the solar battery, and   heating to bond the hot-melt adhesive layer with the anti-reflection layer.   
     
     
         17 . The method according to  claim 16 , further comprising:
 removing the release layer and the substrate; and   sintering at a high temperature to volatilize the hot-melt adhesive layer, fuse the electrodes to the surface of the solar battery.