Wafer for solar cell, method of producing wafer for solar cell, method of producing solar cell, and method of producing solar cell module

Abstract

Provided is a wafer for solar cell which can be produced using a polycrystalline semiconductor wafer cut out using a bonded abrasive wire, which wafer can be used for manufacturing a solar cell with high conversion efficiency. In a wafer for solar cell before acid texturing of the present invention, produced from a polycrystalline semiconductor wafer cut out using a bonded abrasive wire, an amorphous layer does not exist, and irregularities caused due to the cutting using the bonded abrasive wire are left in at least one surface of the wafer for solar cell.

1 . A wafer for solar cell before acid texturing, produced from a polycrystalline semiconductor wafer cut out using a bonded abrasive wire,
 wherein an amorphous layer does not exist, and irregularities caused due to the cutting using the bonded abrasive wire are left in at least one surface of the wafer for solar cell.   
     
     
         2 . A method of producing a wafer for solar cell before acid texturing, from a polycrystalline semiconductor wafer cut out using a bonded abrasive wire,
 wherein at least one surface of the polycrystalline semiconductor wafer is etched by bringing an alkaline solution containing alkali containing N as a constituent element into contact with the surface, such that an amorphous layer does not exist, and irregularities caused due to the cutting using the bonded abrasive wire are left in the at least one surface.   
     
     
         3 . The method of producing a wafer for solar cell, according to  claim 2 , wherein the alkaline solution contains hydrogen peroxide. 
     
     
         4 . The method of producing a wafer for solar cell, according to  claim 2 , wherein the alkaline solution contains a surfactant. 
     
     
         5 . The method of producing a wafer for solar cell comprising a step of acid texturing the at least one surface of the wafer for solar cell produced according to  claim 2 . 
     
     
         6 . A method of producing a solar cell further comprising, in addition to the steps of the method of producing a wafer for solar cell according to  claim 5 , a step of producing a solar cell from the wafer for solar cell. 
     
     
         7 . A method of producing a solar cell module further comprising, in addition to the steps of the method of producing the solar cell according to  claim 6 , a step of producing a solar cell module from the solar cell.