ECN publication
Title:
Cost effective n-Pasha solar cells with efficiency above 20%
 
Author(s):
 
Published by: Publication date:
ECN Solar Energy 27-5-2013
 
ECN report number: Document type:
ECN-V--13-009 Article
 
Number of pages: Full text:
7 Download PDF  

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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