Paste and manufacturing method of solar cell using the same

摘要

Disclosed are a paste and a method for manufacturing a solar cell through screen printing said paste. The paste contains inorganic powder; an organic solvent; and a binder, and the inorganic powder has a tap density of 0.01 to 20 g/cm3. An etching mask pattern formed using said paste has good etch resistance in an etch-back process by which a selective emitter is formed, and thus, a stable emitter can be formed.

主权项

1. A method for manufacturing a solar cell, comprising:
(a) preparing a silicon semiconductor substrate doped with a first conductive impurity; (b) forming an emitter layer on the substrate by doping an upper portion of the substrate with a second conductive impurity having the opposite polarity to the first conductive impurity; (c) forming an etching mask pattern at a front electrode connection area on the emitter layer using a paste comprising inorganic powder, an organic solvent and a binder; (d) etching back the emitter layer by using the etching mask pattern as a mask; (e) removing the etching mask pattern remaining after the etch-back; (f) forming an anti-reflection film over a front surface of the substrate; (g) establishing a connection between a front electrode and the front electrode connection area by penetrating through the anti-reflection film; and (h) establishing a connection between a rear electrode and a rear surface of the substrate, wherein the inorganic powder consists of the inorganic powder having a tap density of 0.01 to 20 g/cm3 and an average particle diameter of 1 nm to 50 nm.