| http://www.w3.org/ns/prov#value | - In order to particularly improve adhesion strength between the back surface electrode 406 and the base material, an oxide component such as TiO2 is preferably included in a small amount in the paste in a printing process, and a metal layer mainly composed of Ti is preferably interposed at an interface between the back surface electrode 406 and the base material in a vapor deposition process.
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