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Evaluating the Aluminum-Alloyed \hbox {p}^{+} -Layer of Silicon Solar Cells by Emitter Saturation Current Density and Optical Microspectroscopy Measurements

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10 Author(s)
Woehl, R. ; Fraunhofer Inst. fur Solare Energiesysteme (ISE), Freiburg, Germany ; Gundel, P. ; Krause, J. ; Ruhle, K.
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Surface-passivated and surface-unpassivated aluminum-alloyed p+-layers are characterized. By varying the firing conditions and the thickness of the screen-printed aluminum paste, different sheet resistances Rsh of the p+-layer were fabricated. The emitter saturation current density J0e plotted versus Rsh follows distinctly different trends for the passivated and unpassivated samples. An aluminum paste with a boron additive achieves a much higher doping concentration and a lower sheet resistance but nevertheless follows the same J0e curves as the pure Al paste. The aluminum p+-layer was quantitatively analyzed with microphotoluminescence and Fano-Raman measurements. The latter shows an increased defect recombination at the interface between the p+-layer and the moderately doped Si bulk. The lower Shockley-Read-Hall lifetime in this region can be attributed to a high defect concentration in the most highly doped layer, represents an impediment to the reduction of J0e for Al-doped emitter regions, and needs to be optimized in future investigations.

Published in:

Electron Devices, IEEE Transactions on  (Volume:58 ,  Issue: 2 )

Date of Publication:

Feb. 2011

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