Patent ID: 8426236
Filing Date: 2013-04-23
Classification: H01L,Y02E

Abstract:
1. A method of a grid stack structure of a solar cell comprising: texturing a surface of a silicon substrate; doping a front side of the silicon with phosphorus to make a n-emitter; screen printing a back side of the silicon substrate with aluminum (Al) metallization and fired at high temperature; depositing a dielectric layer, which acts as an antireflection coating (ARC) on the n-emitter; applying a mask on the front side to define the grid opening of the dielectric layer; etching to open the unmasked grid area; light-induced plating on the front side grid with electrical contact to the backside Al; stripping the mask layer; rapid thermal annealing the light induced plated layer to form a thin layer of silicide; depositing a barrier layer on the silicide; depositing a layer of Cu on top of the silicide/barrier film; and depositing a protective layer on top of the Cu layer.