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ECN publication
Efficiency potential of solar cells based on compensated multicrystalline silicon material
Published by: Publication date:
ECN Solar Energy 6-9-2010
ECN report number: Document type:
ECN-M--10-014 Conference Paper
Number of pages: Full text:
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Presented at: 25th European Photovoltaic Solar Energy Conference and Exhibition - 5th World Conference on Photovoltaic Energy Conversion, Valencia, Spain, 6-10 september 2010.

The purpose of the present work is evaluation of the impact of Cr-contamination on solar cell properties of compensated multicrystalline silicon (mc-Si) ingots. Cr is an effective recombination centre of practical relevance. Studying its effects in compensated material allows monitoring the dependence of solar cell characteristics on resistivity. Therefore, two compensated materials were investigated: with and without addition of 20 ppm wt Cr to the high-purity Si feedstock. Lifetime measurements on as-cut wafers showed more than one order of magnitude decrease in case of Cr-containing samples. Solar cell manufacturing was accomplished for p-type wafers utilizing two different emitter sheet resistances and a conventional industrial screen-print process. It was found that gettering and hydrogenation involved in cell processing significantly improved material properties in the presence of Cr. As a result cell performance was comparable to the compensated reference. Efficiencies of p-type cells in the range of 15.7% were achieved for this heavily Cr-contaminated, compensated mc-silicon of a resistivity of 4

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