Metallization paste for solar cells

摘要

A metallization paste or ink for making electrical contacts on solar cells has reduced diffusion in a silicon wafer. The paste or ink is configured for printing on a crystalline silicon substrate of a solar cell, wherein the paste comprises silicon particles, aluminum particles, and a paste vehicle. Alternatively, the paste comprises aluminum-silicon alloy particles.

主权项

1. A method of generating an interdigitated backside contact solar cell, comprising: generating at least one p-doped region and at least one n-doped region at a rear side of a silicon substance;
depositing a first aluminum-silicon paste on the at least one p-doped region to form a first metallization layer; and depositing a second aluminum-silicon paste on the at least one n-doped region to form a second metallization layer, wherein each of the first aluminum-silicon paste and the second aluminum-silicon paste consists essentially a mixture of aluminum particles and silicon particles, wherein the silicon particles comprising nanoparticles having higher surface area, and are more reactive and having lower melting point than silicon particles of the silicon substance so that the nanoparticles react with the aluminum particles before the aluminum particles react with the silicon particles of the silicon substance, and configured to reduce a depth of aluminum diffusion into the silicon substance and forming an aluminum-silicon alloy layer partially extending into the silicon substance.