Silicon Solar Cell (276-0124) Hints and Tips Faxback Doc. # 17162 Q: Which are the front and back of this cell in order to solder leads? A: The front is blue/dark and is negative. Solder the lead to the silver bar on the front edge. The back is positive. The lead can be soldered to any place on the back. Soldering Tips - Put flux on cell first. Put the solder on tip. Place wire on cell. Drag tip across wire. Do not hold solder tip down on cell in one spot as this may lift the coating off the cell.