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Title:
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Cost effective n-Pasha solar cells with efficiency above 20%
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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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27-5-2013
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ECN report number:
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Document type:
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ECN-V--13-009
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Article
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Number of pages:
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Full text:
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7
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Download PDF
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Published in: Photovoltaics International (PV-Tech), , 2013, Vol.20, p.33-40.
Abstract:
This paper presents recent developments of ECN’s n-Pasha (passivated on all sides H-pattern) solar cell technology. The n-Pasha cell, currently being produced on an industrial scale by Yingli Solar, is a solar cell fabricated on n-type Cz material with homogeneous diffusions, dielectric passivation and printed metallization on both sides. The metallization is applied in an open H-pattern to both sides, which makes it suitable for bifacial applications. In order to improve both cell performance and the cost of ownership of n-Pasha solar cells, the ECN R&D team has focused on several aspects of the device design and processing. By reducing metal coverage and improving the quality of the front-side metallization, tuning the back-surface field (BSF) doping and improving the front- and rear-surface passivation, it has been possible to obtain an average efficiency of 20%, with top efficiencies of 20.2%. At the same time, the amount of silver used for metallization has been decreased by over 50% and is now similar to that used for p-type solar cells. Furthermore, it is shown that with the ECN n-Pasha cell concept, wafers from the full resistivity range of n-Cz ingots can be used to make cells without losses in efficiency. Combining the improved efficiency and the reduction in cost makes the n-Pasha cell concept a very cost-effective solution for manufacturing highly efficient solar cells and modules.
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