Solar cell and fabricating method thereof

A fabricating method of a solar cell, the method comprising:

• forming a second conductive-type semiconductor layer by doping a front surface of a first conductivity-type semiconductor substrate with a second conductivity-type impurity having a conductivity opposite to that of the first conductivity-type semiconductor substrate;
• forming an anti-reflection film on a front surface of the second conductive-type semiconductor layer formed on the front surface of the first conductive-type semiconductor layer;
• forming at least one opening exposing a part of the front surface of the second conductive-type semiconductor layer by etching the anti-reflection film;
• forming at least one front electrode contacting the part of the front surface of the second conductivity-type semiconductor layer exposed through the at least one opening formed at the anti-reflection film on the front surface of the second conductive-type semiconductor layer;
• and
• forming at least one rear electrode formed on a rear surface of the first conductivity-type semiconductor substrate,
• wherein the forming of the at least one front electrode is achieved by applying an electrode paste in the at least one opening using a screen printing method or a direct printing method and performing heat treatment, and the electrode paste includes a metal containing silver (Ag) or a metal alloy containing silver (Ag), lead-free glass frit, and a resin binding agent dispersed in an organic medium.