SELECTIVELY PATTERNED NANO-POROUS STRUCTURE ON SILICON SUBSTRATE FOR SOLAR CELL AND PREPARATION METHOD THEREOF

摘要

PURPOSE: A silicon substrate for a solar battery on which a selective pattern with a nano-porous structure is formed and manufacturing method thereof are provided to form a nano-porous structure on the silicon substrate to reduce reflectivity, thereby increasing the lifetime of a carrier. CONSTITUTION: A desired pattern is formed on a silicon substrate by a photolithographic method. Nitric acid and hydrofluoric acid are mixed so that an acid mixture solution is manufactured. The acid mixture solution is mixed with water whose amount is 1~5 times larger than the acid mixture solution so that a diluted acid mixture solution is manufactured. The silicon substrate is dipped in the diluted acid mixture solution so that a nano-porous structure is formed in the pattern.