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Title:
Development towards 20% efficient n-type Si MWT solar cells for low-cost industrial production
 
Author(s):
Guillevin, N.; Heurtault, B.; Aken, B.B. van; Bennett, I.J.; Jansen, M.J.; Berkeveld, L.D.; Geerligs, L.J.; Weeber, A.W.; Zhiyan, Hu ; Gaofei, Li ; Wenchao, Zhao; Jianming, Wang; Ziqian,  Wang; Yingle, Chen; Yanlong,  Shen; Jianhui, Chen; Bo, Yu; Shuquan, Tian; Jingfeng, Xiong
 
Published by: Publication date:
ECN Solar Energy 22-3-2012
 
ECN report number: Document type:
ECN-M--12-011 Conference Paper
 
Number of pages: Full text:
14 Download PDF  (263kB)

Presented at: SolarCon China, Shanghai, , 20-22 maart 2012.

Abstract:
Compared to traditional H-pattern cells, back-contact Metal Wrap Through (MWT) cells allow higher efficiency at cell level thanks to the front metallisation coverage, and higher efficiency at module level thanks to the reduced interconnection resistance losses. We have developed, in collaboration between ECN and Yingli Solar, n-type mono-crystalline MWT solar cell technology leading to efficiencies up to 19.7% (in-house measurements) on large area wafers (239 cm²). In this article, we demonstrate that efficiency of MWT cells reproducibly exceeds the front contact H-pattern cells based on the equivalent technology by about 0.25% absolute. Based on a loss analysis, we present solutions which open the possibility for further efficiency increase. We also describe module results where approximately 3% power increase has been obtained on MWT module over the corresponding H-pattern tabbed module (273 Wp for MWT versus 265 Wp for H-pattern module). Options to reduce cost and improve efficiency at module level are also discussed.


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