Connected structure and method for manufacture thereof

Abstract

A method for electrically connecting a surface electrode of a solar battery cell and a wiring member via a conductive adhesive film, wherein the conductive adhesive film contains an insulating adhesive and conductive particles, and wherein when the ten point height of roughness profile and maximum height of the surface of the surface electrode in contact with the conductive adhesive film are Rz (μm) and Ry (μm) respectively, the average particle diameter r (μm) of the conductive particles is equal to or greater than the ten point height of roughness profile Rz, and the thickness t (μm) of the conductive adhesive film is equal to or greater than the maximum height Ry.

1 . A method for electrically connecting a surface electrode of a solar battery cell and a wiring member via a conductive adhesive film,
 wherein the conductive adhesive film contains an insulating adhesive and conductive particles, and   wherein when a ten point height of roughness profile and maximum height of a surface of the surface electrode in contact with the conductive adhesive film are Rz (μm) and Ry (μm) respectively,   an average particle diameter r (μm) of the conductive particles is equal to or greater than the ten point height of roughness profile Rz, and a thickness t (μm) of the conductive adhesive film is equal to or greater than the maximum height Ry.   
     
     
         2 . The connection method according to  claim 1 , wherein the wiring member is a film-like conductive member. 
     
     
         3 . The connection method according to  claim 1 , wherein the wiring member comprises as a main component one or more metals selected from the group consisting of Cu, Ag, Au, Fe, Ni, Pb, Zn, Co, Ti, and Mg. 
     
     
         4 . The connection method according to  claim 1  wherein the surface electrode is an electrode provided on a surface of one or more wafers selected from the group consisting of a monocrystalline silicon wafer, a polycrystalline silicon wafer, an amorphous silicon wafer, and a compound semiconductor wafer. 
     
     
         5 . A conductive adhesive film used for electrically connecting a surface electrode of a solar battery cell and a wiring member, containing
 an insulating adhesive and conductive particles,   wherein when a ten point height of roughness profile and maximum height of a surface of the surface electrode in contact with the conductive adhesive film are Rz (μm) and Ry (μm) respectively,   an average particle diameter r (μm) of the conductive particles is equal to or greater than the ten point height of roughness profile Rz, and a thickness t (μm) of the conductive adhesive film is equal to or greater than the maximum height Ry.   
     
     
         6 . The conductive adhesive film according to  claim 5 , wherein the wiring member is a film-like conductive member. 
     
     
         7 . The conductive adhesive film according to  claim 5 , wherein the wiring member comprises as a main component one or more metals selected from the group consisting of Cu, Ag, Au, Fe, Ni, Pb, Zn, Co, Ti, and Mg. 
     
     
         8 . The conductive adhesive film according to  claim 5 , wherein the surface electrode is an electrode provided on a surface of one or more wafers selected from the group consisting of a monocrystalline silicon wafer, a polycrystalline silicon wafer, an amorphous silicon wafer, and a compound semiconductor wafer. 
     
     
         9 . A solar battery module having a structure in which a plurality of solar battery cells having a surface electrode are connected via a wiring member electrically connected to the surface electrode,
 wherein the surface electrode and the wiring member are connected by the conductive adhesive film according to  claim 5 .