Conductive aluminum paste composition for topcon-type solar cell electrode and topcon-type solar cell layered with reverse surface electrode being fired body of composition

A conductive aluminum paste composition for TOPCon Si solar cell electrodes, the conductive aluminum paste composition comprising an aluminum-silicon alloy powder, an organic vehicle, and a glass powder,

• wherein
• (1) the aluminum-silicon alloy powder has a silicon concentration of 30 mass % or more and 40 mass % or less, and
• (2) the glass powder contains a first glass powder and a second glass powder, and
• the first glass powder contains 45% or more and 71% or less of PbO, 5% or more and 35% or less of B2O3, and 0.1% or more and 25.0% or less of SiO2 in terms of oxide mol %, and a value of [(x+y)/z] is in a range of 0.40 or more and 1.00 or less where the content of B2O3 is x mol %, the content of SiO2 is y mol %, and the content of PbO is z mol %, and
• the second glass powder contains 35.0% or more and 55.0% or less of B2O3, 5.0% or more and 10.0% or less of SiO2, 1.0% or more and 20.0% or less of BaO, 5.0% or more and 25.0% or less of CaO, and 3.0% or more and 30.0% or less of K2O in terms of oxide mol %, and does not substantially contain PbO.