Solar cell lead wire, method of making the same, and solar cell

A method of making a solar cell lead wire, comprising:

• forming a strip-shaped conducting material by applying a roll processing or a slit processing to a raw conducting material;
• forming a concave-convex conducting material having a concavity on top and under surfaces thereof, respectively, and a convexity on a side surface thereof by applying a die processing to the strip-shaped conducting material;
• heat-treating the concave-convex conducting material by using a continuous current heating furnace, a continuous heating furnace or a batch heating equipment;
• and
• forming a molten solder plated layer so as to have a flat surface by supplying a molten solder to the concavity.