NOVELTY - The method involves using a nail (4) on a rear surface of a corrugated shaped galvanized steel plate (2) for a rafter (3) such that a solar cell (1) is formed on the surface of the galvanized steel plate after fixing the rafter to the rear surface of the galvanized steel plate. A nut is used on the rear surface of a galvanized steel plate, which welds a bolt using metal-bonding agent or adhesive agent (10). A galvanized iron is directly struck against the rafter. An arc welding part or metal bonding agent part is formed on the surface of a galvanized steel plate.    USE - Processing method for forming a solar cell i.e. quantum dot-type solar cell, on a surface of a corrugated shaped galvanized steel plate used as roof material e.g. folded-plate roof material and slate roof material, for a house e.g. dairy cow shed and compost depot (all claimed). Can also be used for a henhouse and a pigsty.    ADVANTAGE - The method enables using the nail on the rear surface of the corrugated shaped galvanized steel plate for the rafter such that the solar cell is formed on the surface of the galvanized steel plate after fixing the rafter to the rear surface of the galvanized steel plate, so that rain water is approached on the surface of the galvanized steel plate, thus preventing that the solar cell peels from the surface of the corrugated shaped galvanized steel plate, and improving adhesiveness, sound insulation effect and heat insulation effect. The method enables making a solar cell lower part of a positive electrode to closely contact a peak part of the galvanized steel plate so as to suppress overheating temperature of the solar cell.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a galvanized iron    (2) a corrugated shaped galvanized steel plate    (3) a processing method for a corrugated shaped galvanized steel plate    (4) a folded-plate roof    (5) an attachment method for a folded-plate roof and a slate roof    (6) a repair method for an asbestos cement sheet    (7) a method for overlapping iron plate large wave sheets    (8) an iron plate large wave    (9) a processing method for an iron plate large wave    (10) a solar cell    (11) an attachment method for a solar cell    (12) a solar cell panel    (13) a processing method for a solar cell panel    (14) a quantum dot-type solar cell    (15) a processing method for a quantum dot-type solar cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a rafter attached to a corrugated shaped galvanized steel plate.    Solar cell (1)    Corrugated shaped galvanized steel plate (2)    Rafter (3)    Nail (4)    Adhesive agent (10)