Method for producing single crystal silicon solar cell and single crystal silicon solar cell

Abstract

A method for producing a single crystal silicon solar cell including the steps of: implanting ions into a single crystal silicon substrate through an ion implanting surface thereof; closely contacting the single crystal silicon substrate and a transparent insulator substrate with each other via a transparent electroconductive adhesive while using the ion implanting surface as a bonding surface; curing and maturing the transparent electroconductive adhesive into a transparent electroconductive film; applying an impact to the ion implanted layer to mechanically delaminate the single crystal silicon substrate to leave a single crystal silicon layer; and forming a p-n junction in the single crystal silicon layer.

1 . A single crystal silicon solar cell produced by a method comprising:
 preparing a transparent insulator substrate and a single crystal silicon substrate having a first conductivity type;   implanting at least one of hydrogen ions and rare gas ions into the single crystal silicon substrate through an ion implanting surface thereof to form an ion implanted layer in the single crystal silicon substrate;   closely contacting the single crystal silicon substrate and the transparent insulator substrate with each other via a transparent electroconductive adhesive while using the ion implanting surface as a bonding surface;   curing and maturing the transparent electroconductive adhesive into a transparent electroconductive film, to bond the single crystal silicon substrate and the transparent insulator substrate to each other;   applying an impact to the ion implanted layer to mechanically delaminate the single crystal silicon substrate to leave a single crystal silicon layer;   forming a diffusion layer having a second conductivity type in the single crystal silicon layer, which conductivity type is different from the first conductivity type, in a manner that a p-n junction is formed in the single crystal silicon layer; and   forming an electrode on the single crystal silicon layer.   
     
     
         2 . A single crystal silicon solar cell produced by the method for producing a single crystal silicon solar cell according to  claim 1 , wherein
 the transparent insulator substrate is made of one selected from the group consisting of quartz glass, crystallized glass, borosilicate glass, and soda-lime glass,   the transparent electroconductive adhesive is configured to contain:
 at least one oxide selected from the group consisting of titanium oxide, zinc oxide, tin oxide, and indium oxide; 
 a donor-forming additive; and 
 at least one resin selected from the group consisting of a silicone resin, an acrylic resin, an alicyclic acrylic resin, a liquid crystal polymer, a polycarbonate, and a polyethylene terephthalate, 
   the ion implantation is conducted at a depth between 0.1 μm inclusive and 5 μm inclusive from the ion implanting surface.   
     
     
         3 . A single crystal silicon solar cell comprising:
 at least, a transparent insulator substrate, a transparent electroconductive film, a single crystal silicon layer in which a p-n junction is formed, and an electrode, which are successively laminated.   
     
     
         4 . The single crystal silicon solar cell according to  claim 3 , wherein the transparent insulator substrate is made of one selected from the group consisting of quartz glass, crystallized glass, borosilicate glass, and soda-lime glass. 
     
     
         5 . The single crystal silicon solar cell according to  claim 3 , wherein the transparent electroconductive film is configured to contain at least one oxide selected from the group consisting of titanium oxide, zinc oxide, tin oxide, and indium oxide, and a donor-forming additive. 
     
     
         6 . The single crystal silicon solar cell according to  claim 4 , wherein the transparent electroconductive film is configured to contain at least one oxide selected from the group consisting of titanium oxide, zinc oxide, tin oxide, and indium oxide, and a donor-forming additive. 
     
     
         7 . The single crystal silicon solar cell according to  claim 3 , wherein the transparent electroconductive film is configured to contain at least one resin selected from the group consisting of a silicone resin, an acrylic resin, an alicyclic acrylic resin, a liquid crystal polymer, a polycarbonate, and a polyethylene terephthalate. 
     
     
         8 . The single crystal silicon solar cell according to  claim 4 , wherein the transparent electroconductive film is configured to contain at least one resin selected from the group consisting of a silicone resin, an acrylic resin, an alicyclic acrylic resin, a liquid crystal polymer, a polycarbonate, and a polyethylene terephthalate. 
     
     
         9 . The single crystal silicon solar cell according to  claim 5 , wherein the transparent electroconductive film is configured to contain at least one resin selected from the group consisting of a silicone resin, an acrylic resin, an alicyclic acrylic resin, a liquid crystal polymer, a polycarbonate, and a polyethylene terephthalate. 
     
     
         10 . The single crystal silicon solar cell according to  claim 6 , wherein the transparent electroconductive film is configured to contain at least one resin selected from the group consisting of a silicone resin, an acrylic resin, an alicyclic acrylic resin, a liquid crystal polymer, a polycarbonate, and a polyethylene terephthalate. 
     
     
         11 . The single crystal silicon solar cell according to  claim 3 , wherein the single crystal silicon layer has a thickness between 0.1 μm inclusive and 5 μm inclusive. 
     
     
         12 . The single crystal silicon solar cell according to  claim 10 , wherein the single crystal silicon layer has a thickness between 0.1 μm inclusive and 5 μm inclusive. 
     
     
         13 . The single crystal silicon solar cell according to  claim 1 , wherein the single crystal silicon solar cell can be seen through from one surface side toward the other surface side. 
     
     
         14 . The single crystal silicon solar cell according to  claim 2 , wherein the single crystal silicon solar cell can be seen through from one surface side toward the other surface side. 
     
     
         15 . The single crystal silicon solar cell according to  claim 3 , wherein the single crystal silicon solar cell can be seen through from one surface side toward the other surface side. 
     
     
         16 . The single crystal silicon solar cell according to  claim 12 , wherein the single crystal silicon solar cell can be seen through from one surface side toward the other surface side.