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Defect Formation in Silicon During Laser Doping

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5 Author(s)
Ohmer, K. ; Inst. fur Photovoltaik, Univ. of Stuttgart, Stuttgart, Germany ; Ye Weng ; Köhler, J.R. ; Strunk, H.P.
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Laser doping in industrial crystalline solar cells creates a selective emitter and thereby enhances the efficiency. Nevertheless, if not done carefully, the irradiation of the semiconductor introduces defects. We have suppressed defect formation by using a laser beam that is focused to a line with a width of only several micrometers. The maximal line width for a defect free recrystallization, however, depends on the surface orientation of the silicon. Using a transmission electron microscope, we find a dislocation-free recrystallized layer on (100)-oriented silicon wafers that are irradiated with a line focus smaller than or equal to 15 μm. For (111)-oriented surfaces, this holds for the use of a 5.2-μm-wide line focus. Wafers that are irradiated with a circular laser focus of diameter D = 36 μm show the formation of microcracks, but no hints of dislocations are found using transmission electron microscopy (TEM).

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Photovoltaics, IEEE Journal of  (Volume:1 ,  Issue: 2 )