Screen printing metallization of boron emitters (pages 20–27)
R. Lago, L. Pérez, H. Kerp, I. Freire, I. Hoces, N. Azkona, F. Recart and J. C. Jimeno
Article first published online: 29 DEC 2009 | DOI: 10.1002/pip.933
The influence of the composition of screen printing metal pastes on contacting boron emitters for crystalline silicon solar cells is analyzed and optimized on the basis of commercial Ag-paste Ferro 3347 by adding silicon and aluminum. Aluminum provides a lower contact resistance, while silicon prevents the spiking and alloying of aluminum with the silicon of the substrate. The results obtained have proven the feasibility of our screen printing process for p+nn+ structures.