A method of manufacture a composition for solar cell electrodes comprising mixing : - 50 wt% to 90 wt% of a conductive powder, wherein the conductive powder comprises at least one selected from the group consisting of silver (Ag), gold (Au), palladium (Pd), platinum (Pt), copper (Cu), chromium (Cr), cobalt (Co), aluminum (Al), tin (Sn), lead (Pb), zinc (Zn), iron (Fe), iridium (Ir), osmium (Os), rhodium (Rh), tungsten (W), molybdenum (Mo), nickel (Ni), and indium tin oxide (ITO), - 1 wt% to 15 wt% of a glass frit, wherein the glass frit comprises leaded glass frits, lead-free glass frits, or mixtures thereof, - 3 wt% to 40 wt% of an organic vehicle, wherein the organic vehicle comprises a binder resin and a solvent, and - 0.01 wt% to 2 wt% of a thixotropic agent, wherein the thixotropic agent comprises at least one selected from the group consisting of amine compounds, castor oil compounds, carbon black compounds, fatty acid amide compounds, fumed silica compounds, organo clay compounds, and nano-scale organic/inorganic particles, wherein the method steps of the composition satisfying the following Formulae 1 to 7: 3 < TI 10 = viscosity at 1 rpm / viscosity at 10 rpm < 5.5 ; 4 < TI 20 = viscosity at 2 rpm / viscosity at 20 rpm < 7 ; 6 < TI 50 = viscosity at 5 rpm / viscosity at 50 rpm < 7.5 ; 6 < TI 100 = viscosity at 10 rpm / viscosity at 100 rpm < 7.5 ; 1 < TI 10 − TI 20 < 2 ; 0.5 < TI 20 − TI 50 < 1.5 ; and 0 < TI 50 − TI 100 < 0.8 , where in formulae 1 to 7, a thixotropic index (TI) is calculated by substituting viscosity values measured at each revolutions per minute (rpm) using a No. 14 spindle by a rotary viscometer at 23°C, after temperature stabilization for 5 minutes, viscosity is measured at the following maintenance time 1 rpm 60 sec, 2 rpm 30 sec, 5 rpm 15 sec, 10 rpm 15 sec, 20 rpm 15 sec, 50 rpm 15 sec and 100 rpm 15 sec. - 50 wt% to 90 wt% of a conductive powder, wherein the conductive powder comprises at least one selected from the group consisting of silver (Ag), gold (Au), palladium (Pd), platinum (Pt), copper (Cu), chromium (Cr), cobalt (Co), aluminum (Al), tin (Sn), lead (Pb), zinc (Zn), iron (Fe), iridium (Ir), osmium (Os), rhodium (Rh), tungsten (W), molybdenum (Mo), nickel (Ni), and indium tin oxide (ITO), - 1 wt% to 15 wt% of a glass frit, wherein the glass frit comprises leaded glass frits, lead-free glass frits, or mixtures thereof, - 3 wt% to 40 wt% of an organic vehicle, wherein the organic vehicle comprises a binder resin and a solvent, and - 0.01 wt% to 2 wt% of a thixotropic agent, wherein the thixotropic agent comprises at least one selected from the group consisting of amine compounds, castor oil compounds, carbon black compounds, fatty acid amide compounds, fumed silica compounds, organo clay compounds, and nano-scale organic/inorganic particles, wherein the method steps of the composition satisfying the following Formulae 1 to 7: 3 < TI 10 = viscosity at 1 rpm / viscosity at 10 rpm < 5.5 ; 4 < TI 20 = viscosity at 2 rpm / viscosity at 20 rpm < 7 ; 6 < TI 50 = viscosity at 5 rpm / viscosity at 50 rpm < 7.5 ; 6 < TI 100 = viscosity at 10 rpm / viscosity at 100 rpm < 7.5 ; 1 < TI 10 − TI 20 < 2 ; 0.5 < TI 20 − TI 50 < 1.5 ; and 0 < TI 50 − TI 100 < 0.8 , where in formulae 1 to 7, a thixotropic index (TI) is calculated by substituting viscosity values measured at each revolutions per minute (rpm) using a No. 14 spindle by a rotary viscometer at 23°C, after temperature stabilization for 5 minutes, viscosity is measured at the following maintenance time 1 rpm 60 sec, 2 rpm 30 sec, 5 rpm 15 sec, 10 rpm 15 sec, 20 rpm 15 sec, 50 rpm 15 sec and 100 rpm 15 sec. <EOS>