Conductive compositions containing Li
View Patent ↗The present invention is directed to an electrically conductive composition comprising (i) an electrically conductive metal, (ii) a component selected from the group consisting of Li 2 RuO 3 , ion-exchanged Li 2 RuO 3 and mixtures thereof, and (iii) a glass frit all dispersed in an organic medium. The present invention is further directed to an electrode formed from the composition and a semiconductor device and, in particular, a solar cell comprising such an electrode. The electrodes provide good adhesion and good electrical performance.
1. An electrically conductive composition comprising:
(a) an electrically conductive metal;
(b) a component selected from the group consisting of Li 2 RuO 3 , ion-exchanged Li 2 RuO 3 and mixtures thereof;
(c) a glass frit; and
(d) an organic medium;
wherein said electrically conductive metal, said component selected from the group consisting of Li 2 RuO 3 , ion-exchanged Li 2 RuO 3 and mixtures thereof, and said glass frit are dispersed in said organic medium.
2. The composition of claim 1 , said composition comprising 50-90 wt % electrically conductive metal, 0.03-5 wt % component selected from the group consisting of Li 2 RuO 3 , ion-exchanged Li 2 RuO 3 and mixtures thereof, 0.5-5 wt % glass frit and 5-50 wt % organic medium, wherein said wt % are based on the total weight of said composition.
3. The composition of claim 2 , said composition comprising, 0.1-1 wt % component selected from the group consisting of Li 2 RuO 3 , ion-exchanged Li 2 RuO 3 and mixtures thereof, wherein said wt % are based on the total weight of said composition.
4. The composition of claim 1 , wherein said component is Li 2 RuO 3 .
5. The composition of claim 1 , wherein said component is ion-exchanged Li 2 RuO 3 , wherein Li atoms have been at least partially exchanged for Al, Ga, K, Ca, Mn, Fe, Mg, H, Na, Cr, Co, Ni, V, Cu, Zn, Ti or Zr atoms, or a combination thereof.
6. The composition of claim 1 , said electrically conductive metal comprising a metal selected from the group consisting of silver, copper, palladium and mixtures thereof.
7. The composition of claim 6 , said electrically conductive metal further comprising a metal selected from the group consisting of nickel, aluminum and mixtures thereof.
8. The composition of claim 6 , said electrically conductive metal comprising silver.
9. The composition of claim 1 , said glass frit comprising a lead-containing glass frit selected from the group consisting of lead silicates, lead borosilicates, lead-tellurium-oxides and mixtures thereof.
10. The composition of claim 1 , said glass frit comprising a lead-free glass frit selected from the group consisting of bismuth silicates, bismuth borosilicates, bismuth-tellurium-oxides and mixtures thereof.
11. A semiconductor device comprising an electrode formed from the composition of claim 1 , wherein said composition has been fired to remove the organic medium and form said electrode.
12. A solar cell comprising an electrode formed from the composition of any of claims 1 - 10 , wherein said composition has been fired to remove the organic medium and form said electrode.