Solar cell and paste composition for electrode of solar cell
Discussed is a paste composition for an electrode of a solar cell, the paste including a conductive powder, an organic vehicle, and an inorganic composition formed by including a plurality of metal compounds including a gallium compound including gallium as a component of a main network former of the inorganic composition.
1. A solar cell including a glass composition, the solar cell comprising:
a semiconductor substrate including a base region having a n-type dopant;
a conductivity type region having a p-type dopant, and formed in or on the semiconductor substrate; and
an electrode connected to the conductivity type region,
wherein the electrode includes a Ag material and the glass composition including gallium oxide and lead oxide,
wherein the glass composition further includes an addition metal compound other than gallium oxide and lead oxide,
wherein a sum weight portion of lead oxide and gallium oxide is larger than a weight portion of the additional metal compound,
wherein the additional metal compound includes at least one of silicon oxide, boron oxide, aluminum oxide, zinc oxide, alkali metal oxide, bismuth oxide, but not tellurium oxide,
wherein a weight portion of lead oxide is equal to or greater than a weight portion of gallium oxide in the glass composition,
wherein the weight portion of gallium oxide is larger than a weight portion of a first metal compound having a largest weight portion among the additional metal compound, and
wherein the weight portion of the gallium oxide is 0.005 to 10 of a total of 100 weight portion of the electrode.
2. The solar cell of claim 1 , wherein gallium oxide is included as a component of a main network former of the glass composition.
3. The solar cell of claim 1 , wherein the glass composition has a melting temperature of about 400 to 500° C.
4. The solar cell of claim 1 , wherein, when a sum of the weight portion of gallium oxide and the weight portion of the lead oxide is a total of 100 weight portion of the sum, the weight portion of gallium oxide is 5 to 30 of the sum and the weight portion of the lead oxide is 70 to 95 of the sum.
5. The solar cell of claim 1 , wherein the weight portion of the gallium oxide is 5 to 30 for a total of 100 weight portion of the glass composition that includes the gallium oxide, the lead oxide, and the additional metal compound.