TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: In the paste composition, the first mean particle diameter is in a range of 1.5-2.5 mu m, the second mean particle diameter is in a range of 4.5-5.55 mu m, and the third mean particle diameter is in a range of 9.5-10.5 mu m. Also, about 20.1-21.1 parts by weight of the first powder, 29.7-37 parts by weight of the second powder, and 12.8-20.1 parts by weight of the third powder are included based on 100 parts by weight of the paste composition. The conductive powder includes aluminum. The first powder, the second powder, and the third powder are spherical powders or non-spherical powders, respectively. The first powder is a spherical powder, the second powder is a non-spherical powder, and the third powder is a spherical powder. The organic vehicle is included in an amount range of 20-30 parts by weight based on 100 parts by weight of the paste composition. The organic vehicle includes a solvent and a binder, the solvent includes terpineol or carbitol, and the binder includes an acryl-based resin, a cellulose-based resin, or an alkyd resin. The paste composition further comprises a glass frit, where the glass frit is included in an amount range of 3-5 parts by weight based on 100 parts by weight of the paste composition. The glass frit includes a lead oxide (PbO)-silicon dioxide (SiO2) system, a PbO-SiO2-boron oxide (B2O3) system, a zinc oxide (ZnO)-SiO2 system, a ZnO-B2O3-SiO2 system, or a bismuth oxide (Bi2O3)-B2O3-ZnO-SiO2 system. The paste composition further comprises an additive, where the additive is included in an amount range of 0.1-10 parts by weight based on 100 parts by weight of the paste composition. The additive includes a dispersant, a thixotropic agent, a leveling agent, or an antifoaming agent. The pate composition further comprises a glass frit and an additive, where the glass frit is included in an amount range of 3-5 parts by weight based on 100 parts by weight of the paste composition, and the additive is included in an amount range of 0.1-10 parts by weight based on 100 parts by weight of the paste composition. The organic vehicle includes a solvent and a binder, the solvent includes terpineol or carbitol, the binder includes an acryl-based resin, a cellulose-based resin, or an alkyd resin, and the additive includes a dispersant, a thixotropic agent, a leveling agent, or an antifoaming agent. The paste composition further comprises a glass frit and an additive, where the glass frit is included in an amount range of 3-5 parts by weight based on 100 parts by weight of the paste composition, and the additive is included in an amount range of about 0.1 to 10 parts by weight based on 100 parts by weight of the paste composition. The organic vehicle includes a solvent and a binder, the solvent includes terpineol or carbitol, the binder includes an acryl-based resin, a cellulose-based resin, or an alkyd resin, and the additive includes a dispersant, a thixotropic agent, a leveling agent, or an antifoaming agent.