Paste for back contact-type solar cell

Abstract

Disclosed is a paste for a back contact-type solar cell that includes: (a) electrically conductive particles containing silver particle and added particles selected from the group consisting of (i) metal particles selected from the group consisting of Mo, Tc, Ru, Rh, Pd, W, Re, Os, Ir and Pt particles, (ii) a metal alloy containing the metal particles, and (iii) particles loaded with the metal particles, (b) glass frit, and (c) a resin binder.

1 . A paste for a back contact-type solar cell, comprising:
 (a) electrically conductive particles containing silver particles and added particles selected from the group consisting of (i) metal particles selected from the group consisting of Mo, Tc, Ru, Rh, Pd, W, Re, Os, Ir and Pt particles (ii) a metal alloy containing the metal particles and (iii) particles loaded with the metal particles;   (b) glass frit; and   (c) a resin binder.   
     
     
         2 . The paste according to  claim 1 , wherein the metal particles are selected from the group consisting of Ru, Rh, Pd, W, and Pt particles. 
     
     
         3 . The paste according to  claim 2 , wherein the metal particles are Ru, Pd or Pt particles. 
     
     
         4 . The paste according to  claim 1 , wherein the content of the silver particle is 40 to 90 wt %, and the content of the added particle is 0.01 to 10 wt % based on the weight of the paste. 
     
     
         5 . The paste according to  claim 4 , the content of a third conductive particle, which is not included the concept of the silver particles nor the added particle, is less than 2 wt % based on the weight of the paste. 
     
     
         6 . A method for producing a solar cell electrode, comprising the steps of:
 (1) applying a paste comprising (a) electrically conductive particles containing silver particle and added particle selected from the group consisting of (i) metal particles selected from the group consisting of Mo, Tc, Ru, Rh, Pd, W, Re, Os, Ir and Pt particles, (ii) a metal alloy containing the metal particles, and (iii) particles loaded with the metal particles, onto the opposite side from the light receiving side of a back contact-type solar cell substrate; and   (2) firing the applied paste.   
     
     
         7 . The method according to  claim 6 , wherein the paste is fired at 450 to 900° C. 
     
     
         8 . A solar cell electrode formed on the opposite side from the sunlight receiving side, comprising as a conductive component:
 silver particle; and   added particle selected from the group consisting of (i) metal particles selected from the group consisting of Mo, Tc, Ru, Rh, Pd, W, Re, Os, Ir and Pt particles, (ii) a metal alloy containing the metal particles, and (iii) particles loaded with the metal particles.