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ECN publication
20.3% MWT silicon heterojunction solar cell – a novel heterojunction integrated concept embedding low Ag consumption and high module efficiency
Coletti, G.; Wu, Y.; Janssen, G.J.M.; Loffler, J.; Aken, B.B. van; Li, F.; Shen, Y.; Yang, W.; Shi, J.; Li, Gaofei; Hu, Zhiyan; Xiong, Jingfeng
Published by: Publication date:
ECN Solar Energy 8-6-2014
ECN report number: Document type:
ECN-M--14-044 Conference Paper
Number of pages: Full text:
6 Download PDF  

In this paper we present the successful integration of a silicon heterojunction (HJ) solar cell with metal wrap through architecture (MWT). This MWT-HJ cell and module technology combines all the advantages of the individual concepts. With this contribution we demonstrate a record device efficiency of 20.3% achieved using commercial n-type Cz 6 inch wafers. To our knowledge this is the first time that cell results for MWT-HJ architecture have been reported. We put this result in perspective providing a solution for the reduced conductivity of low temperature silver pastes used for HJ cell fabrication. We propose a method to increase the solar cell performance up to 4%rel together with a 50% cost of ownership reduction of the front silver metal including plug and conductive adhesive. This is possible solely by the optimization of the front metal grid in this MWT structure predicting efficiencies above 21%. MWT-HJ is a fully low-temperature integrated cell and module concept and compatible also with next generation thinner wafers.

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