Patent ID: 9343591
Filing Date: 2016-05-17
CPC Classification: H01L,Y02E

Claim Text:
1. A process of forming a front-side solar cell contact a silicon wafer having a p-type region, an n-type region, a p-n junction and an ARC layer on said front-side, comprising: a. applying an ARC layer to the front-side of the silicon wafer, b. printing a paste A having fire-through capability on the ARC layer, wherein the paste A is printed as a plurality of thin parallel finger lines having gaps therein to form a bottom print of split finger lines, c. printing a paste B over paste A, wherein the paste B is printed in a grid pattern comprising wherein the total printed area of pastes A and B is less than 10% of the area of the front-side, and d. firing the double-printed silicon wafer, wherein the paste A comprises, wherein the paste A providing lower contact resistance than paste B, when both are fired, wherein the paste B comprises an organic vehicle and an inorganic portion comprising (b1) at least one electrically conductive metal powder and (b2) glass frit, and wherein at least one of paste A or paste B further comprises 0.01 to 5 wt % of an organolithium compound.