Patent ID: 7883343
Filing Date: 2011-02-08
Classification: H01L,Y02E,Y02P

Abstract:
1. A method of fabricating a solar cell comprising the steps of: a) providing a silicon substrate having a front surface and a back surface, b) forming a first doped region of first conductivity type in the back surface and a thermally grown silicon oxide layer over the doped region, c) printing a patterned etch resist over the back surface whereby a plurality of rows across the back surface are not masked, d) removing exposed silicon oxide from the back surface, e) removing the patterned etch resist from the back surface, f) removing exposed silicon from the back surface extending through the first doped region, g) diffusing a dopant of second conductivity type into the back surface where silicon oxide was removed in step d) thereby forming a plurality of regions of second conductivity type between regions of first conductivity type and a thermally grown oxide over the back surface, and h) forming first and second interdigitated metal contacts respectively ohmically contacting the regions of first conductivity type and the regions of second conductivity type, including: