Process for producing crystalline silicon bodies having a structure which increases the surface area, and use of said bodies as substrates for solar cells and catalysts

摘要

The invention relates to a process for producing silicon bodies (1,2,3) with at least one of their surfaces having a honeycomb cell structure (2,3) which increases the surface area, and to the use of said bodies. The honeycomb cell structure (2,3) is introduced into the surface (4) by etching, in particular by electrolytic etching in an electrolyte containing hydrofluoric acid, the silicon body (1) being connected as positive electrode. The process is used to produce substrates for silicon solar cells whose front face has a surface which totally absorbs light as a result of the honeycomb cell structure. It may also be used to produce substrates for coating catalysts.