Texture etching solution, additive solution for texture etching solution, texture forming substrate and method for producing textured substrate and solar cell

摘要

This invention: provides, at low cost, a texture-etching liquid and a liquid additive therefor that make it easy to stably reproduce a highly uniform pattern of minute pyramidal concavities and convexities that is suitable for use in a monocrystalline solar cell or the like; uses said texture-etching liquid to provide a textured substrate having a uniform pattern of minute pyramidal concavities and convexities; and provides a high-efficiency solar cell using said textured substrate. Either a texture-etching liquid containing an alkali component, a tannin, and a stilbene derivative or a texture-etching liquid to which a liquid additive containing a tannin with a concentration of up to 30 wt.% and a stilbene derivative with a concentration of up to 30 wt.% is added is used to manufacture a silicon substrate with at least one surface thereof textured and a solar cell that contains said silicon substrate with (one of) the textured surface(s) thereof on a light-receiving-surface side.