| 摘要 |
A silicon solar cell and a method for preparing a rear contact bus bar region of a solar cell, the solar cell comprising a silicon substrate 3, an aluminium-containing layer 5 on a rear side surface 7 of the silicon substrate 3 and an additional metallic bus bar contact layer 15 on the rear side surface 7 of the silicon substrate 3; wherein the aluminium-containing layer 5 comprises an exposure area 9 at which silicon of the substrate 3 is exposed and the additional metallic bus bar contact layer 15 is deposited onto the exposure area 9 by spray coating techniques. The metallic bus bar contact layer preferably comprises less than 50 vol% silver and more preferably comprises no silver. Such spray coating techniques allow using metals other than silver thereby enabling substantial cost-savings. Furthermore, as the bus bar contact layer 15 directly contacts the exposed area 9 of the silicon substrate 3, good ohmic and mechanically adhesive contact may be established and peeling-off may be prevented. |
