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Title:
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Emitter and contact optimization for high-efficiency IBC Mercury cells
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Author(s):
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Published by:
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Publication date:
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ECN
Solar Energy
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24-6-2016
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ECN report number:
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Document type:
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ECN-M--16-014
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Conference Paper
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Number of pages:
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Full text:
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4
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Download PDF
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Abstract:
In this paper we present the results of a study of the emitter contact properties of the Mercury cell, which is an n-type IBC cell with a front floating emitter. We found that contact recombination becomes higher and contact resistance becomes lower with higher firing temperature. Additionally, the contacts to light and heavy emitters were evaluated and the results showed that in case of a heavier emitter, the emitter contact recombination is reduced. The emitter contact resistance to both the light and heavy emitter appeared to only depend on the sheet resistance, but not on the exact shape of the doping profile. The contact recombination, calculated from measured Voc values of test structures, appeared to be dependent on which side of the sample was illuminated: extracted Voc values from front side illumination lead to much lower fitted J0,contact values than from rear side illumination. Quokka simulations indicate that the lower front side illumination values are closer to the real values, which can be calculated from the results of the measurements with either orientation.
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