NOVELTY - Sheet component formed using single crystal silicon sheet and a support are washed, dried and bonded to obtain bonded sheet. The bonded sheet is annealed under protection atmosphere of nitrogen gas or helium gas. Ion injection layer is removed and surface roughness of upper silicon layer is adjusted. Surface treatment is carried out in atmosphere containing sulfur hexafluoride. A p-n junction is formed in obtained black silicon product. Aluminum layer is used as back electrode, and front electrode is formed. Thus, solar battery is manufactured.    USE - Manufacture of solar battery.    ADVANTAGE - The solar battery is efficiently, stably and economically manufactured.    DETAILED DESCRIPTION - Hydrogen ion and/or helium ion is injected into a single crystal silicon sheet, or porous silicon is added to single crystal silicon sheet, and single crystal silicon is epitaxially grown on porous silicon to obtain a sheet component. One or two films of silica, silicon carbide, alumina or silicon nitride are deposited on substrate made of glass, ceramics, stainless steel or plastics as an intermediate layer and a separation layer by sputtering or vacuum evaporation method. An aluminum film layer is plated, and a support is obtained. The sheet component and support are washed, dried and bonded under normal temperature and pressure, or vacuum to obtain bonded sheet. The bonded sheet is annealed under protection atmosphere of nitrogen gas or helium gas at 300-1500 degrees C. The silicon sheet is etched, polished and recycled. Ion injection layer is removed using chemical mechanical polishing unit for polishing residual layer of bonded sheet, and surface roughness of upper silicon layer is adjusted. Surface treatment is carried out in atmosphere containing sulfur hexafluoride. A p-n junction is formed in obtained black silicon product by doping boron and phosphorus in upper silicon layer. Aluminum layer is used as back electrode, and front electrode is formed by screen printing, photoetching, electron beam evaporation, and electron plating method to obtain solar battery.