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A process for producing front and rear contacts on a solar cell provides for producing a channel structure on the passivation layer of a silicon wafer, producing a rear contact by printing and firing a silver paste that has an aluminum dopant, treating the wafer with a palladium solution containing

A process for producing front and rear contacts on a solar cell provides for producing a channel structure on the passivation layer of a silicon wafer, producing a rear contact by printing and firing a silver paste that has an aluminum dopant, treating the wafer with a palladium solution containing fluoride to produce a nucleation layer on the surface of the channel structure, and reinforcing the nucleation layer by depositing a further metal.

대표청구항 ▼

A process for producing front and rear side contacts on a solar cell including a silicon wafer having a flat p/n transition and a passivation layer on a front side which comprises the steps of: producing a channel structure in the passivation layer; producing a rear side contact by printing on and f

A process for producing front and rear side contacts on a solar cell including a silicon wafer having a flat p/n transition and a passivation layer on a front side which comprises the steps of: producing a channel structure in the passivation layer; producing a rear side contact by printing on and firing a silver-containing paste which additionally comprises oxidic additives and aluminum as a dopant; treating the silicon wafer with an ionogenic palladium solution containing fluoride ions to produce a nucleation layer on a surface of the silicon wafer exposed in the channel structure; reinforcing the nucleation layer by deposition of at least one further metal from the ionogenic palladium solution. A process as claimed in claim 1, wherein said step of producing a channel structure includes: defining the channel structure by photolithography and forming the channel structure by wet chemical etching.