ELECTRODE WIRE FOR SOLAR CELL, SUBSTRATE THEREOF, AND SUBSTRATE MANUFACTURING METHOD

摘要

Provided is a pre-coating straight-angle substrate of an electrode wire for a solar cell having superior resistance to cracking and being formed of slit materials of pure copper plate which has desirable adhesion with a coating applied on the obverse face thereof. The substrate is formed of slit materials of pure copper thin plate containing 99.90mass% or more copper, with an obverse face arithmetical mean deviation (Ra) of 0.05-0.3µm, an obverse face maximum height (Rz) of 0.05-2.5µm, a ratio (Rq/Rz) of a root mean square (Rq) to the maximum height (Rz) of the obverse face of 0.06-1.1, and a ratio (Ls/L) of a total special grain boundary length (Ls) of a special grain boundary to a total length of a crystalline grain boundary (L), as measured with EBSD by a scanning electron microscope with backscatter electron diffraction pattern system attached within a depth of 10µm from the obverse surface, of 40-90%.