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A conductive silver via paste comprising particulate conductive silver, a vanadium-phosphorus-oxide and an organic vehicle is particularly useful in providing the metallization of the holes in the silicon wafers of MWT solar cells. The result is a metallic electrically conductive via between the col

A conductive silver via paste comprising particulate conductive silver, a vanadium-phosphorus-oxide and an organic vehicle is particularly useful in providing the metallization of the holes in the silicon wafers of MWT solar cells. The result is a metallic electrically conductive via between the collector lines on the front side and the emitter electrode on the back-side of the solar cell. The paste can also be used to form the collector lines on the front-side of the solar cell and the emitter electrode on the back-side of the solar cell. Also disclosed are metal-wrap-through silicon solar cells comprising the fired conductive silver paste.

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1. A conductive silver paste comprising: (a) 85-95 wt % silver;(b) 0.2-5.5 wt % vanadium-phosphorus-oxide consisting of 80-94 wt % and 6-20 wt % P2O5, wherein the wt % of the V2O5 and P2O5 are based on the total weight of said vanadium-phosphorus-oxide; and(c) 5-20 wt % organic vehicle, wherein said

1. A conductive silver paste comprising: (a) 85-95 wt % silver;(b) 0.2-5.5 wt % vanadium-phosphorus-oxide consisting of 80-94 wt % and 6-20 wt % P2O5, wherein the wt % of the V2O5 and P2O5 are based on the total weight of said vanadium-phosphorus-oxide; and(c) 5-20 wt % organic vehicle, wherein said silver and said vanadium-phosphorus-oxide are dispersed in said organic vehicle and wherein the wt % of the silver, the vanadium-phosphorus-oxide and the organic vehicle are based on the total weight of the conductive silver paste. 2. The conductive silver paste of claim 1, wherein said silver is in the form of spherical silver particles. 3. The conductive silver paste of claim 2, said spherical silver particles having a d50 of from 1.7 to 1.9 μm and a d10≧1 μm and a d90≦3.8 μm. 4. The conductive silver paste of claim 1, wherein said silver is in the form of irregular particles having a d50 of from 5.4 to 11.0 μm and a d90 of from 9.6 to 21.7 μm. 5. The conductive silver paste of claim 1, said vanadium-phosphorus-oxide consisting of 82-88 wt % V2O5 and 12-18 wt % P2O5, wherein the wt % are based on the total weight of said vanadium-phosphorus-oxide. 6. A metal-wrap-through silicon solar cell with an n-type or a p-type silicon base comprising the fired conductive silver paste of claim 5. 7. The conductive silver paste of claim 1, said vanadium-phosphorus-oxide consisting of 90-94 wt % V2O5 and 6-10 wt % P2O5, wherein the wt % are based on the total weight of said vanadium-phosphorus-oxide. 8. A metal-wrap-through silicon solar cell with an n-type or a p-type silicon base comprising the fired conductive silver paste of claim 7. 9. The conductive silver paste of claim 1, said conductive silver paste comprising 85-92 wt % silver and 0.5 to 2 wt % vanadium-phosphorus-oxide, based on the total weight of said conductive silver paste. 10. A metal-wrap-through silicon solar cell with an n-type or a p-type silicon base comprising the fired conductive silver paste of claim 9. 11. The conductive silver paste of claim 1, said conductive silver paste comprising 88-92 wt % silver and 4 to 5 wt % vanadium-phosphorus-oxide, based on the total weight of said conductive silver paste. 12. A metal-wrap-through silicon solar cell with an n-type or a p-type silicon base comprising the fired conductive silver paste of claim 11. 13. The conductive silver paste of claim 1, said conductive silver paste further comprising a sintering inhibitant. 14. The conductive silver paste of claim 1, said conductive silver paste comprising: 0.1 to 1 wt % sintering inhibitant titanium resinate, based on the total weight of the conductive silver paste. 15. The conductive silver paste of claim 1, said conductive silver paste comprising 0.1 to 1 wt % sintering inhibitant titanium dioxide, based on the total weight of the conductive silver paste. 16. A metal-wrap-through silicon solar cell with an n-type or a p-type silicon base comprising the fired conductive silver paste of claim 1. 17. A conductive silver paste further comprising: (a) 85-95 wt % silver;(b) 0.2-5.5 wt % vanadium-phosphorus-oxide consisting of 80-94 wt % V2O5 6-20 wt % P2O5, and 0.1-1 wt % TiO2, wherein the wt % of the V2O5, P2O5 and TiO2 are based on the total weight of said vanadium-phosphorus-oxide; and(c) 5-20 wt % organic vehicle, wherein said silver and said vanadium-phosphorus-oxide are dispersed in said organic vehicle and wherein the wt % of the silver, the vanadium-phosphorus-oxide and the organic vehicle are based on the total weight of the conductive silver paste. 18. A metal-wrap-through silicon solar cell with an n-type or a p-type silicon base comprising the fired conductive silver paste of claim 17. 19. The conductive silver paste of claim 17, said conductive silver paste further comprising a sintering inhibitant.