Method of manufacturing finger electrode for solar cell
A method of manufacturing a finger electrode for a solar cell, the method including printing a conductive paste on a front surface of a substrate using a printing mask having an opening rate of about 65% or more and baking the printed conductive paste. The conductive paste includes a conductive powder, a glass frit including about 30 mol % to about 60 mol % of tellurium oxide and about 0.1 mol % to about 10 mol % of tungsten oxide, and an organic vehicle.
1. A method of manufacturing a finger electrode for a solar cell, the method comprising:
(a) printing a conductive paste on a front surface of a substrate using a printing mask having an opening rate of about 65% or more, the printing mask including a mesh, a photosensitive resin layer integrated with the mesh, and an electrode printing portion formed by removing the photosensitive resin layer; and
(b) baking the printed conductive paste,
wherein the conductive paste includes a conductive powder, a glass frit including about 30 mol % to about 60 mol % of tellurium oxide and about 0.1 mol % to about 10 mol % of tungsten oxide, and an organic vehicle.
2. The method as claimed in claim 1 , wherein the printing mask has an opening rate of about 65% to about 90%.
3. The method as claimed in claim 1 , wherein:
the mesh includes weft threads, and
a distance between weft threads of the mesh above and below the electrode printing portion is greater than a distance between weft threads of the mesh in other regions.
4. The method as claimed in claim 1 , wherein baking of the conductive paste is performed at about 600° C. to about 1,000° C.
5. The method as claimed in claim 1 , wherein the glass frit further includes at least one of lead (Pb) and bismuth (Bi) and at least one selected from lithium (Li), zinc (Zn), and magnesium (Mg) oxides.
6. The method as claimed in claim 1 , wherein the conductive paste includes about 60 wt % to about 95 wt % of the conductive powder, about 0.5 wt % to about 20 wt % of the glass frit, and about 1 wt % to about 30 wt % of the organic vehicle.
7. The method as claimed in claim 1 , wherein the conductive paste further includes at least one additive selected from a dispersant, a thixotropic agent, a plasticizer, a viscosity stabilizer, an anti-foaming agent, a pigment, a UV stabilizer, an antioxidant, and a coupling agent.
8. A finger electrode for a solar cell manufactured by the method of manufacturing a finger electrode for solar cells as claimed in claim 1 .
9. A solar cell including the finger electrode as claimed in claim 8 .