Patent ID: 8614115

Claim:
A method for manufacturing a photovoltaic solar cell device, comprising: forming a p-n junction having a first doping density, comprising: providing a wafer with a wafer surface, texturing the wafer, and applying a first cleaning to the wafer surface; performing a first doping on the wafer surface to provide a doped material on the wafer surface; diffusing the doped material into the wafer from the wafer surface, to realize the first doping density; reducing surface oxide, applying a second cleaning to the wafer surface, and applying a passivation on the wafer surface; providing metallization of the high doped areas through patterned deposition and/or aligned laser treatment; enhancing formation of the p-n junction by introducing a second doping density to form high doped areas for a dual emitter application, comprising: performing a second doping with a high doping density that is patterned using a mask pattern, to provide a second doped material on the wafer surface; and performing a first diffusion and a second diffusion of the second doped material into the wafer from the wafer surface, to realize the second doping density, wherein the high doped areas are defined by a masking process integrated with the formation of the p-n junction, resulting in the mask pattern of the high doped areas, wherein the metallization of the high doped areas occurs in accordance with the mask pattern of the high doped appears, and wherein the first diffusion is performed at a lower temperature than the second diffusion.