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ECN publication
Pilot line results of N-type IBC cell process in mass production environment
Guillevin, N.; Cesar, I.; Burgers, A.R.; Venema, P.; Wang, Z.; Zhai, jinye; Liu, D.
Published by: Publication date:
ECN Solar Energy 25-9-2017
ECN report number: Document type:
ECN-M--17-025 Conference Paper
Number of pages: Full text:
7 Download PDF  

Presented at: EUPVSEC, Amsterdam, , 25-29 september 2017.

Together with Yingli Solar and Tempress Systems, ECN accelerates the development of the Mercury IBC technology by implementing its low-cost cell process in a mass production environment. The Mercury solar cell concept based on a bifacial IBC cell design with a front floating emitter (FFE) can now be fully processed on Yingli’s pilot line. Pilot processing in an industrial environment offers a great opportunity for the Mercury technology to gain in maturity through an effective bottom-up approach. With a cell process using similar specifications as the commercial n-PERT process, the implementation of the Mercury IBC technology went fast reaching cell efficiencies close to 21% in less than a year. The FFE which renders the cell resilient to electrical shading and reduces the demands on feature size, allowing a high tolerance cell processing. This key feature of the Mercury cell concept plays a major role when it comes to high throughput industrial manufacturing up to module level. Before the end of the year, a set of optimisations will be applied to the rear-side diffusion pattern and to the metallisation with the objective the reach cell efficiencies of 22%. Manufacturability aspects, lab performance and the results of piloting the IBC Mercury technology are described in this paper. Further efficiency gain towards 24% based on the use of polysilicon is also discussed in this paper.

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