Patent ID: 9379258
Filing Date: 2016-06-28
CPC Classification: H01L,Y02E

Claim Text:
1. A method for making a back contact back junction solar cell, comprising: printing a first patterned field emitter paste on the back surface of a solar cell substrate, said patterned field emitter paste having a doping polarity opposite said solar cell substrate doping polarity; printing a second patterned emitter paste on said back surface of said solar cell substrate, said patterned emitter paste having a doping polarity opposite said solar cell substrate; forming a patterned base paste on said back surface of said solar cell substrate, said patterned base paste having a doping polarity the same as said solar cell substrate doping polarity; annealing said solar cell substrate, concurrently forming field emitter regions corresponding to said first patterned field emitter paste, emitter contact regions corresponding to said second patterned emitter paste, and base contact regions corresponding to said patterned base paste; etching said first patterned field emitter paste, said second patterned emitter paste, and said patterned base paste; depositing a backside passivation layer on said back surface of said solar cell; opening contacts to said emitter contact regions and said base contact regions through said backside passivation layer; and forming patterned base metallization and patterned emitter metallization making electrical interconnections to said base contact regions and said emitter contact regions.